Topics of Particle, Astro and Cosmo Frontiers (TOPAC 2023)

1 Jun 2023, 10:00 → 4 Jun 2023, 16:00 Asia/Shanghai

Tsung-Dao Lee Institute/S5F-S500 - Lecture Hall (Tsung-Dao Lee Institute)

2023年6月2-4日将于上海交通大学（SJTU）李政道研究所（TDLI）举办粒子物理、天体和宇宙学前沿课题研讨会（TOPAC: Topics of Particle, Astro and Cosmo Frontiers），

https://indico-tdli.sjtu.edu.cn/event/1637

粒子物理、天体物理和宇宙学的研究使人们对自然界基本规律有了更深入的了解， 不同学科之间的交叉，使前沿研究课题不断呈现。中微子振荡和暗物质粒子是超出标准模型的两个新物理现象，与天体物理和宇宙学关系密切；引力波和超高能中微子的观测也打开了多信使天文学的时代，为探测宇宙早期的极端物理现象提供了检验标准模型和寻找新物理的探测途径。在粒子物理、天体和宇宙学相互交叉的前沿领域，还有更多新的理论想法和实验进展不断涌现。本会议将为相关领域专家提供一个相互交流的平台，深入探讨目前的研究现状和未来的可能方向，促进国内相关研究领域的发展。在三天的会议中，将设置味物理，中微子、暗物质，天体物理、宇宙学、引力波等多个主题。

会议将于6月1日（周四）下午开始报到，2-4日为线下正式报告；除口头报告外，还将为学生和博士后提供海报展示，欢迎大家参会，注册截止日期为5月20日。会议收取注册费，老师和博士后 1500元/人、学生1000元/人；统一安排食宿，费用自理。

本次会议由上海交通大学李政道研究所（TDLI/SJTU）主办，北京大学（PKU）、中科院理论物理研究所（ITP）、中国高等科学技术中心（CCAST）协办。

 

组织委员会（拼音顺序）：

葛韶锋（上海交通大学李政道研究所）

何小刚（上海交通大学李政道研究所）

舒菁（北京大学）

于江浩（中科院理论物理研究所）
 

会务秘书：汪雯（wang.wen@sjtu.edu.cn）

 

TOPAC会议手册.pdf

Thursday, 1 June

Registration

Friday, 2 June

08:20 Opening

DM

Conveners: Jianglai Liu (Shanghai Jiao Tong University), Prof. Shao-Feng Ge (TDLI-SJTU)

1 Anisotropy of the dark matter flux and the related direct detection

Speaker: Yu-Feng Zhou

migdal_yfzhou.pdf

2 Status and prospects of CDEX

The China Dark Matter Experiment (CDEX) pursues direct searches of light dark matter particles and neutrinoless double beta decay at the China Jinping Underground Laboratory (CJPL), which is the deepest operating laboratory for astroparticle research.
The CDEX employs germanium semi-conductor detector which has low energy threshold and excellent energy resolution. We report the latest novel physics results from CDEX-1 and CDEX-10 and describe the physics goals, progress and key technologies of the ongoing CDEX-50m and CDEX-300u programs, which are aimed at the dark matter search and neutrinoless double beta decay, respectively.

Speaker: Mr Shukui Liu (Sichuan University)

20230602-TOPAC2023-CDEX.pdf

3 dark matter searches with PandaX experiment

PandaX experiment uses xenon as target to detect weak and rare physics signals, including dark matter and neutrinos. We are running a new generation detector with 4-ton xenon in the sensitive volume, PandaX-4T. The commissioning run data has pushed the constraints on WIMP-nucleon scattering cross section to a new level. In this talk, I will give an overview of PandaX-4T latest results on dark matter physics, with some novel channels to explore the physics capability of xenon detector. I will also briefly discuss the future prospects of PandaX.

Speaker: Ning Zhou (Shanghai Jiao Tong University)

20230602_TDLI.pdf

10:10 Break

Flavor

Conveners: Jianping Ma, Michael Ramsey-Musolf (TDLI-SJTU)

4 Recent progress in muon electric and magnetic dipole moments

Speaker: Prof. Kim Siang Khaw (TDLI/SJTU)

TOPAC2023_Khaw_20230602 (1).key

5 Flavor Physics at CEPC - A General Perspective

Pulsar timing arrays (PTAs) consisting of widely distributed and well-timed millisecond pulsars can serve as a galactic interferometer to detect gravitational waves. With the same data acquired for PTAs, we propose (https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.121401) to develop pulsar polarization arrays (PPAs), to explore astrophysics and fundamental physics. As in the case of PTAs, PPAs are best suited to reveal temporal and spatial correlations at large scales that are hard to mimic by local noises.

As one scientific case for the PPAs, we consider the detection of axion-like wave dark matter (WDM). Because of its tiny mass, the axion-like WDM can be generated as a Bose-Einstein condensate, characterized by a strong wave nature. It can also affect the polarization of pulsar light via its Chern-Simons coupling, yielding ​an effect of ``birefringence'', while the light travels across the halo. In this talk, the speaker will demonstrate the excellent capability of PPAs; and their complementarity with the PTAs in such a scientifically important task.

Speaker: Prof. Tao Liu (HKUST)

FlavorPh_TDL_2023Jun.pdf

6 Four-body baryonic $B\to{\bf B_1\bar B'_1 B_2 \bar B'_2}$ decays

We would like to present our recent study of the four-body baryonic $B\to{\bf B_1\bar B'_1 B_2\bar B'_2}$ decay. We explain the branching fraction of $\bar B^0\to p\bar p p\bar p$ measured by LHCb as small as $2.2\times 10^{-8}$. We also predict the following branching fractions: ${\cal B}(B^-\to n\bar p p\bar p)=(8.4^{+2.1}_{-1.0}\pm 0.4^{+3.4}_{-1.9})\times 10^{-8}$, ${\cal B}(B^-\to \Lambda\bar p p\bar p)=(3.7^{+0.3}_{-0.1}\pm 0.02^{+1.8}_{-1.3})\times 10^{-7}$ and ${\cal B}(\bar B^0_s\to \Lambda\bar \Lambda p\bar p)=(1.9^{+0.3}_{-0.1}\pm 0.01^{+1.1}_{-0.6})\times 10^{-7}$, with several being accessible to experimental facilities.

Speaker: Yu-Kuo Hsiao (Shanxi Normal University)

Baryonic_2023.06.02.pdf

7 Perspective on the Emergence of Mass

Atomic nuclei lie at the core of everything we can see; and at the first level of approximation, their atomic weights are simply the sum of the masses of all the neutrons and protons (nucleons) they contain. Each nucleon has a mass mN ≈ 1 GeV, i.e. approximately 2000-times the electron mass. The Higgs boson - discovered at the large hadron collider in 2012 - produces the latter, but what generates the masses of the neutron and proton? This is a pivotal question. Modern theory suggests that the answer lies within quantum chromodynamics (QCD), the strong-interaction piece of the Standard Model. Yet, it is far from obvious. In fact, removing Higgs-boson couplings into QCD, one arrives at a scale invariant theory, which, classically, can’t support any masses at all. This presentation will sketch forty years of developments in theory that suggest a solution to the puzzle and highlight an array of experiments that can validate the picture.

Speaker: Craig Roberts

230605_TDLeeTOPAC_RobertsCD.pdf

Lunch

Axion

Conveners: Jun Gao, Yuichiro Nakai

8 Axion Cavity at Quantum Level

We show that at the quantum level the single axion-photon conversion rate is enhanced by the cavity quality factor Q, and quantitatively larger than the classical result by a factor π/2. Thus, the axion cavity can be considered as a quantum device emitting single-photons with temporal separations. This differs from the classical picture in which axions transition in batches and the converted energy accumulates in the electromagnetic field inside the cavity.

Speaker: Qiaoli Yang

searchaxions.pdf

9 axion, magnetic monopole and detection of new axion couplings

The Witten effect implies interaction between axion and magnetic monopole, and the quantum electromagnetodynamics (QEMD) properly describes electric charges, magnetic charges and photons. Based on the QEMD, a generic low-energy axion-photon effective field theory can be built. This generic axion-photon Lagrangian introduces the interactions between axion and two four-potentials, and leads to new axion-modified Maxwell equations. We properly solve the new axion-modified Maxwell equations and obtain the axion-induced electromagnetic fields given a static electric or magnetic field. I will also mention our proposals of new search strategies to measure the new axion couplings for sub-$\mu$eV axion in haloscope experiment.

Speaker: Tong Li (Nankai University)

axion_TDLI.pdf

10 Millicharged particles from proton bremsstrahlung in the atmosphere

Light millicharged particles can be copiously produced from meson decays in cosmic ray collisions with the atmosphere, leading to detectable signals in large underground neutrino detectors. In this paper we study a new channel to produce millicharged particles in the atmosphere, the proton bremsstrahlung process. We find that the proton bremsstrahlung channel can produce a much larger flux of millicharged particles than the previously studied meson decay channel, resulting in an improvement on the SuperK limit by nearly one order of magnitude. Consequently, SuperK can probe new parameter space beyond the current leading limits from ArgoNeuT. We further note that the study on the proton bremsstrahlung process can be extended to other atmospherically produced light particles, and to millicharged particle searches in proton accelerators.

Speaker: Prof. Zuowei Liu (Nanjing University)

230602-TDLI.pdf

11 GKZ hypergeometric systems of the three-loop vacuum Feynman integrals

We present the Gel'fand-Kapranov-Zelevinsky (GKZ) hypergeometric systems of the Feynman integrals of the three-loop vacuum diagrams with arbitrary masses, basing on Mellin-Barnes representations and Miller's transformation. The codimension of derived GKZ hypergeometric systems equals the number of independent dimensionless ratios among the virtual masses squared. Through GKZ hypergeometric systems, the analytical hypergeometric series solutions can be obtained in neighborhoods of origin including infinity. The linear independent hypergeometric series solutions whose convergent regions have non-empty intersection can constitute a fundamental solution system in a proper subset of the whole parameter space. The analytical expression of the vacuum integral can be formulated as a linear combination of the corresponding fundamental solution system in certain convergent region.

Speaker: Dr Zhang Hai-Bin (Hebei University)

PPT-3L-vacuum-GKZ.pdf

DM

Conveners: Wei Chao (BNU), Xun Xue (East China Normal University)

12 Probing Cosmic Beam-dump DM in Direct Detections

In this talk, I will talk about the production of sub-GeV DM from the cosmic ray collision with the atmosphere and the prospects in direct detection. I will highlight the importance of quasi-elastic scattering in the earth-stopping effect.

Speaker: Lei Wu (Nanjing Normal Univeristy)

2023-上海交大.pptx

13 Dark matter searches with the CMB

Dark matter candidates like the WIMPs and primordial black holes are involved in long-time scale energy emission processes, such as annihilation, decay, black hole evaporation and accretion. Such energy injection during the dark age of the Universe modifies the cosmic ionization and temperature evolution, which lead to observeable impacts on the anistropy spectrum of the cosmic microwave background, as well as in major CMB derivatives, like the 21cm signal, and precision cosmological fits. I will discuss the current status and near-future prospects of the these CMB-related methods for dark matter indirect searches.

Speaker: Dr Yu Gao (IHEP)

DM_CMB_上海2023_gao.pdf

DM_CMB_上海2023_gao.pptx

14 Asymmetric dark matter with a spontaneously broken U(1)': self-interaction and gravitational waves

Motivated by the collisionless cold dark matter small scale structure problem, we propose an asymmetric dark matter model where dark matter particle interact with each other via a massive dark gauge boson. This model easily avoid the strong limits from cosmic microwave background (CMB) observation, and have a large parameter space to be consistent with small scale structure data. We focus on a special scenario where portals between dark sector and visible sector are too weak to be detected by traditional methods. We find that this scenario can increase the effective number of neutrinos ($N_{eff}$).In addition, the spontaneous $U(1)′$ symmetry breaking process, which makes dark gauge boson massive, can generate stochastic gravitational waves with peak frequency around $10^{−6}−10^{−7}$ Hz.

Speaker: Mengchao Zhang (Jinan University)

TDLI_MengchaoZhang.pdf

15 Probing Mirror Twin Higgs with Present and Future Weak Lensing Surveys

We explore the potential of precision cosmological data to study non-minimal dark sectors by updating the cosmological constraint on the mirror twin Higgs model (MTH). The MTH model addresses the Higgs little hierarchy problem by introducing dark sector particles. In the early Universe, the mirror baryon and mirror radiation behave as dark matter and dark radiation, and their presence modifies the Universe's expansion history. Additionally, the scattering between mirror baryon and photon generates the dark acoustic oscillation process, suppressing the matter power spectrum from the cosmic shear measurement. We demonstrate how current weak lensing data constrain these corrections to the $\Lambda$CDM cosmology and find that for a viable solution to the little hierarchy problem, the proportion of MTH dark matter cannot exceed about $30\%$ of the total dark matter density, unless the temperature of twin photon is less than $30\%$ of that of the standard model photon. While the MTH model is presently not a superior solution to the observed $H_0$ tension compared to the $\Lambda$CDM+$\Delta N_{\rm eff}$ model, we demonstrate that it has the potential to alleviate both the $H_0$ and $S_8$ tensions, especially if the $S_8$ tension persists in the future and approaches the result reported by the Planck~SZ~(2013) analysis. In this case, the MTH model can relax the tensions while satisfying the DES power spectrum constraint up to $k < 10~h\rm {Mpc}^{-1}$. If the MTH model is indeed accountable for the $S_8$ and $H_0$ tensions, we show that the future China Space Station Telescope (CSST) can determine the twin baryon abundance with a $10\%$ level precision.

Speaker: Yue-Lin Sming Tsai (Purple Mountain Observatory)

DM_THM_GL.pdf

15:10 Break

Cosmo

Conveners: Luca Visinelli (Shanghai Jiao Tong University), Prof. Yingli Zhang (Tongji University)

16 Analytical methods and results for inflation correlators

Inflation correlators encode ultra-high-energy physics at the inflation scale and are promising targets for future cosmological observations. Theory-wise, these objects are boundary correlators of bulk dS quantum fields, which play crucial roles in our understanding of QFT in dS. However, the analytical computation of dS correlators is notoriously difficult, and significant progress has been made only in recent years. In this talk, I shall introduce our recent efforts in understanding and computing inflation correlators. I shall describe new analytical tools we have developed, including the partial Mellin-Barnes representation, the bootstrap equations, and the spectral decomposition. I shall also present new results and insights we obtained with these techniques, including exact and analytical expressions for a wide range of inflation correlators at both tree and 1-loop levels, a 1-loop factorization theorem, the cutting rule, and the boundary OPE.

Speaker: Zhong-Zhi Xianyu (Tsinghua University)

AnalyticalCorrelator_TOPAC2023_TDLI.pdf

17 Inflation and Dark Matter with Weyl Symmetry

The cosmological observations of cosmic microwave background and large-scale structure indicate that our universe has a nearly scaling invariant power spectrum of the primordial perturbation. However, the exact origin for this primordial spectrum is still unclear. We present a theoretical framework and several viable models to explain cosmic inflation and dark matter simultaneously, both are important ingredients for the formation of cosmic structures. We also discuss the connection with standard Starobinsky inflation and difference in the prediction on the magnitude of primordial gravitational waves, which may be probed by future experiments on cosmic microwave background.

Speaker: Prof. Yong Tang (University of Chinese Academy of Sciences)

TANGyong-TDLi.pdf

18 Particle Physics Studies with Gravitational Waves: Three Approaches

I will briefly go over the three approaches of particle physics studies with gravitational waves: early universe phase transitions, topological and non-topological solitons and environmental effects, and highlight some recent developments on the theory side and on experimental detection that we have made in each of the fields.

Speaker: Huaike Guo (UCAS (ICTP-AP))

Huaike.pdf

19 Dark matter constraints from the observations of synchrotron emission

Synchrotron related process has been widely used to explore the properties of the dark sector. In this talk, I will discuss two examples: constraining dark matter annihilation from the Event Horizon Telescope observations of M87 and from Planck observations of Galactic synchrotron foreground.

Speaker: Ran Ding

TOPAC2023_dingran.pdf

20 Distinguishing the thermal history from structure formation

Structure formation has been used as a means to constrain the velocities of dark matter particles. For some typical models, such constraints are converted as constraints on dark-matter mass.
In this work, we explore the implications of these constraints on the thermal history of dark matter.
We find that they can constrain the decoupling temperatures in both the SM sector and the dark sector, but the constraints differ significantly between different scenarios such as relativistic/non-relativistic freeze-out, and freeze-in.
We also show that, given a model assumption, complementary information from different observations can help us determine the thermal history of dark matter.

Speaker: Mr Yuan-Zhen Li

TOPAC2023-Yuan-Zhen Li.pdf

Flavor

Conveners: Dingyu Shao, Yifeng Sun (SJTU)

21 Flavor Gauged 2HDM after RK 2022 Release

Does the updated lepton non-universality parameter, given by LHCb in December 2022, imply that new physics in b to s window has faded way? In this work, we aim to answer this question by making global fits of Wilson coefficients in four different scenarios taking into account 196 observables in leptonic and semileptonic decays of B mesons and bottom baryons. We find that new physics opportunities in some of the Wilson coefficients still exist. We further discuss a type of 2HDM accommodated with flavor symmetries combing constraints from RD and g-2 and relevant parameter space is also explored.

Speaker: Prof. Fanrong Xu (Jinan University)

20230602_frxu.pdf

22 Charmless two-body B decays from the perturbative QCD approach

In this presentation we would first introduce the basic idea of transversal momentum dependent ($k_T$) factorization theorem and its application in B meson decays, then we would show our recent calculation of charmless $B \to PP, PV, VV$ decay with including all the known next-to-leading-order QCD corrections, the $\pi K$ puzzle would also be mentioned.

Speaker: Shan Cheng (Hunan University)

2bodyBdecay-scheng.pdf

23 Revisiting Xi_Q−Xi_Q^prime mixing in QCD sum rules

Speaker: Prof. Zhen-Xing Zhao

24 New physics in s->d semileptonic transitions: rare hyperon vs. kaon decays

Rare semi-leptonic decays of kaon and hyperon play an important role in testing the standard model of particle physics and searching for new physics. Based on the recent progresses from BESIII, NA48/2 and LHCb Collaboration, in this work we studied two kinds of semi-leptonic decays of kaon and hyperon, which are characterized as $s\to d\nu\bar{\nu}$ and $s\to d\mu^+\mu^-$ transitions at the quark level. We have applied the low-energy effective Hamiltonian approach to calculate the branching ratios and angular observables of relevant decay channels and used the isospin symmetry and chiral perturbation theory to address the non-perturbative contributions. By analyzing advantages and disadvantages of two types of semi-leptonic kaon and hyperon decays for constraint on new physics, we found that the anticipated BESIII data of the hyperon decays can better constrain the effect of new physics compared to kaon decays of the same kind. However, the conclusion will change when considering the effect of renormalization group evolution. It indicates that the loop effects from renormalization group evolution are important in this context, when relating the low-energy effective field theory to new physics models in the UV.

Speaker: Dr 瑞祥 史 (北京航空航天大学)

Hyperon2023.6.2.pdf

25 Precise Hyperon Physics at BESIII

With the large datasets on e^+ e^- annihilation at the J/ψ and ψ(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been observed in J/ψ and ψ(3686) to ΛΛ ̅,ΣΣ ̅,ΞΞ ̅ and ΩΩ ̅. The decay parameters for the most common hadronic weak decay modes were measured, and due to the non-zero polarization, the parameters of hyperon and antihyperon decays could be determined independently of each other for the first time. Comparing the hyperon and antihyperon decay parameters yields precise tests of direct, ΔS=1 CP-violation that complement studies performed in the kaon sector.

Speaker: Jianyu Zhang

2023-06-02 TOPAC2023_jyzhang.pdf

17:35 Break

Poster session and buffer dinner

26 Quantum calculation of axion-photon transition in electromagnetodynamics for cavity haloscope

The Witten effect implies the presence of electric charge of magnetic monopole and possible relationship between axion and dyon. The axion-dyon dynamics can be reliably built based on the quantum electromagnetodynamics (QEMD) which was developed by Schwinger and Zwanziger in 1960’s. A generic low-energy axion-photon effective field theory can also be realized in the language of “generalized symmetries” with higher-form symmetries and background gauge fields. In this work, we implement the quantum calculation of axion-single photon transition rate inside a homogeneous electromagnetic field in terms of the new axion interaction Hamiltonian in QEMD. This quantum calculation can clearly imply the enhancement of conversion rate through resonant cavity in axion haloscope experiments. We also show the promising potentials on the cavity search of new axion-photon couplings in QEMD.

Speaker: RUIJIA ZHANG (Nankai University)

TOPAC2023_zrj.pdf

27 Probing “pure” Right-Handed Sleptons at colliders

Speaker: Wenxing Zhang

Poster_Wenxing_Zhang.pdf

28 Guage-invariant Electroweak Interaction Parameters and Their oblique corrections in The B-LSSM

Using Pinch technique, we calculate the one-loop level vertices of weak interactions in the B-LSSM and add their Pinch contributions to the self energy of gauge bosons, whose gauge invariance is thereby guaranteed. Compared with low-energy effective Lagrangian of weak interaction, new $Z'$ neutral current which appears in B-LSSM can not be well matched. Therefore, we add some terms to the effective Lagrangian to solve this trouble. Considering the limitations from the current experiments, parameters of the model should be confined.

Speaker: 生恺 崔 (HeBei University)

演示文稿1.pdf

29 CP Violating Dark Photon Kinetic Mixing and Type-III Seesaw

The hypothetical dark photon portal connecting the visible and dark sectors of the Universe has received considerable attention in recent years, with a focus on CP-conserving kinetic mixing between the Standard Model (SM) hypercharge gauge boson and a new U(1)$_X$ gauge boson. In the effective field theory context, one may write down non-renormalizable CP-violating kinetic mixing interactions involving the $X$ and SU(2)$_L$ gauge bosons.
We construct for the first time a renormalizable model for CP-violating kinetic mixing that induces CP-violating non-Abelian kinetic mixing at mass dimension five.
The model grows out of the type-III seesaw model, with the lepton triplets containing right-handed neutrinos playing a crucial role in making the model renormalizable and providing
a bridge to the origin of neutrino mass. This scenario also accommodates
electron electric dipole moments (EDM) as large as current experimental bound, making future EDM searches an important probe of this scenario.

Speaker: Jin Sun (Shanghai Joao Tong University)

sunjin.pdf

30 Lepton flavor violating decays lj → liγ in the U(1)XSSM model within the Mass Insertion Approximation

Three singlet new Higgs superfields and right-handed neutrinos are added to MSSM to obtain
U(1)XSSM model. Its local gauge group is SU(3)C × SU(2)L × U(1)Y × U(1)X. In the framework
of U(1)XSSM, we study muon anomalous magnetic moment and lepton flavor violating decays
lj → liγ(j = 2, 3;i = 1, 2) within the Mass Insertion Approximation(MIA). Through the MIA
method, we can find the parameters that directly affect the analytical result of the lepton flavor
violating decays lj → liγ, which make our work more convenient. We want to provide a set of
simple analytic formulas for the form factors and the associated effective vertices, that may be very
useful for future phenomenological studies of the lepton flavor violating decays. According to the
accuracy of the numerical results which the influence of different sensitive parameters, we come to
the conclusion that the non-diagonal elements which correspond to the generations of the initial
lepton and final lepton are main sensitive parameters and lepton flavor violation(LFV) sources.
This work can provide a clear signal of new physics(NP).

Speaker: 彤彤 王 (河北大学)

王彤彤poster.pdf

31 Lightest Higgs boson decays h→MZ in the μ from ν supersymmetric standard model

We study the lightest Higgs boson decays $h\rightarrow MZ$ in the $\mu$ from $\nu$ supersymmetric standard model ($\mu\nu$SSM), where $M$ is a vector meson $(\rho,\omega,\phi,J/\Psi,\Upsilon)$. Compared to the minimal supersymmetric standard model (MSSM), the $\mu\nu$SSM introduces three right-handed neutrino superfields, which lead to the mixing of the Higgs doublets with the right-handed sneutrinos. The mixing affects the lightest Higgs boson mass and the Higgs couplings. In suitable parameter space, the $\mu\nu$SSM can give large new physics (NP) contributions to the signal strengths of $h\rightarrow MZ$ and $h\rightarrow \gamma\gamma$, which may be detected by a 100 TeV collider or the other future high energy colliders.

Speaker: Changxin Liu

poster_Changxin Liu.pdf

32 Soft Scattering Evaporation of Dark Matter Subhalos by Inner Galactic Gases

The large gap between a galactic dark matter subhalo's velocity and its own gravitational binding velocity creates the situation that small subhalos can be evaporated before dark matter thermalize with baryons due to the low binding velocity. In case dark matter acquires an electromagnetic dipole moment, the survival of low-mass subhalos requires stringent limits on the photon-mediated soft scattering. Within the current direct detection limits, we calculate the DM kinetic decoupling temperature in the Early Universe and evaluate the smallest protohalo mass. In the late Universe, low-mass subhalos can be evaporated via soft collision by ionizied gas and accelerated cosmic rays. We calculate the subhalo evaporation rate via dipole-charge scattering and place an upper limit on the DM's dipole form factor by assuming the survival of subhalos in the ionized Galactic interior.

Speaker: Yugen Lin (IHEP,CAS)

Poster_Yugen Lin(林宇根).pdf

33 The electromagnetic decays of X(3823) as the "ψ" _𝟐(𝟏^𝟑 𝑫_𝟐) state and its radial excited states

We study the electromagnetic (EM) decays of $X(3823)$ as the $\psi_2(1^{3}D_{2})$ state by using the relativistic Bethe-Salpeter method. Our results are $\Gamma[X(3823)\rightarrow\chi_{_{c0}}\gamma]=1.2$ keV, $\Gamma[X(3823)\rightarrow\chi_{_{c1}}\gamma]=265$ keV, $\Gamma[X(3823)\rightarrow\chi_{_{c2}}\gamma]=57$ keV and $\Gamma[X(3823)\rightarrow\eta_{_c}\gamma]=1.3$ keV. The ratio ${\cal B}[X(3823)\rightarrow\chi_{_{c2}}\gamma]/{\cal B}[X(3823)\rightarrow\chi_{_{c1}}\gamma]=0.22$, agrees with the experimental data. Similarly, the EM decay widths of $\psi_{_2}(n^{3}D_{_2})$, $n=2,3$, are predicted, and we find the dominant decays channels are $\psi_{_2}(n^{3}D_{_2})\rightarrow\chi_{_{c1}}(nP)\gamma$, where $n=1,2,3$. The wave function include different partial waves, which means the relativistic effects are considered. We also study the contributions of different partial waves.

Speaker: Wei Li (He Bei University)

poster-Li Wei.pdf

34 The Higgs boson masses and Higgs decays in the B-LSSM with explicit CP violation

We calculate one-loop radiation corretions to the mass matrix of the neutral Higgs boson in the B-L Supersymmetric Standard Model (B-LSSM) with explicit CP violation. Within the effective potential methods,the masses of the neutral Higgs-boson are calculated at the one-loop level by taking into account the contributions of the following loops of ordinary particles and superparticles: the top quarks,the bottom quarks,the scalar top quarks and the scalar bottom quarks. At the same time,we also calculate the lightest Higgs decays $h^0\rightarrow \gamma\gamma$,$h^0\hspace{-0.1cm}\rightarrow \hspace{-0.1cm}f\bar{f}$,$h^0\hspace{-0.1cm}\rightarrow \hspace{-0.1cm}VV^*($V=W,Z$)$,$h^0\hspace{-0.1cm}\rightarrow\hspace{-0.1cm} gg $ in the B-L supersymmetric standard model (B-LSSM) with explicit CP violation.

Speaker: Wen-Hui Zhang (河北大学)

河北大学张文慧.pdf

35 Two-loop corrections to b→sγ in TNMSSM

The rare decay b→sγ is important to research new physics beyond the standard model(SM).In this work, we investigate two loop electroweak
corrections to b→sγ in the next to minimal supersymmetric extension of the SM with adding two triplets and one singlet(TNMSSM).In this framework,new particles and new definition of squarks can affect the theoretical predictions of the process, with respect to the MSSM. Considering the constraints from updated experimental data, the numerical results show that the TNMSSM can fit the experimental data for the branching ratios of b→sγ.The results of the rare decays also further constrain the parameter space of the TNMSSM.

Speaker: 海翔 陈

海报.pdf

36 On the possibility of mixed axion/neutralino dark matter in specific SUSY DFSZ axion models

We introduce four supersymmetric (SUSY) axion models in which the strong CP problem and the $\mu$ problem are solved with the help of the Peccei-Quinn mechanism and the Kim-Nilles mechanism, respectively. The axion physics enriches the SUSY model by introducing axion as a dark matter candidate and, therefore, the lightest supersymmetric particle (LSP) could just be a part of the total dark matter. For this reason, axion relieves the tensions between SUSY models and numerous experimental measurements, such as the dark matter direct detection experiments and the precise measurements of anomalous magnetic moment of the muon $a_\mu$. In the present paper, we consider the constraints from the latest $a_\mu$ data and the LZ-2022 bound on the relic density of higgsino-like LSP, and discuss the possibility that axion is the rest of dark matter.

Speaker: Zhong Jun Yang

37 Forbidden Dark Matter Combusted Around Supermassive Black Hole

The forbidden dark matter cannot annihilate into a pair of heavier partners, either SM particles or its partners in the dark sector, at the late stage of cosmological evolution by definition. We point out the possibility of reactivating the forbidden annihilation channel around supermassive black holes. Being attracted towards a black hole, the forbidden dark matter is significantly accelerated to overcome the annihilation threshold. The subsequent decay of the annihilation products to photon leaves a unique signal around the black hole, which can serve as a smoking gun for the forbidden dark matter. For illustration, the Fermi-LAT data around Sgr A∗ provides a preliminary constraint on the thermally averaged cross section of the reactivated forbidden annihilation that is consistent with the DM relic density requirement.

Speaker: Yu Cheng

2023TOPAC_程昱.pdf

38 Transverse-momentum-dependent wave functions and soft functions at one-loop in large momentum effective theory

In large-momentum effective theory (LaMET), the transverse-momentum dependent (TMD) light-front wave functions and soft functions can be extracted from the simulation of a four-quark form factor and equal-time correlation functions. In this work, using expansion by regions we provide a one-loop proof of TMD factorization of the form factor. For the one-loop validation, we also present a detailed calculation of O(α s) perturbative corrections to these quantities, in which we adopt a modern technique for the calculation of the TMD form factor based on the integration by part and differential equation. The one-loop hard functions are then extracted. Using lattice data from Lattice Parton Collaboration on quasi-TMDWFs, we estimate the effects from the one-loop matching kernel and find that the perturbative corrections depend on the operator to define the form factor, but are less sensitive to transverse separation. These results will be helpful in precisely extracting the soft functions and TMD wave functions from the first principle in the future.

Speaker: Zhifu Deng

邓志福.pdf

39 Light-cone distribution amplitudes of a light baryon in large-momentum effective theory

Momentum distributions of quarks/gluons inside a light baryon in a hard exclusive process are encoded in the light-cone distribution amplitudes (LCDAs). In this work, we point out that the leading twist LCDAs of a light baryon can be obtained through a simulation of a quasi-distribution amplitude calculable on lattice QCD within the framework of the large-momentum effective theory. We calculate the one-loop perturbative contributions to LCDA and quasi-distribution amplitudes and explicitly demonstrate the factorization of quasi-distribution amplitudes at the one-loop level. Based on the perturbative results, we derive the matching kernel in the MS scheme and regularization invariant momentum-subtraction scheme. Our result provides a first step to obtaining the LCDA from first principle lattice QCD calculations in the future.
Momentum distributions of quarks/gluons inside a light baryon in a hard exclusive process are encoded in the light-cone distribution amplitudes (LCDAs). In this work, we point out that the leading twist LCDAs of a light baryon can be obtained through a simulation of a quasi-distribution amplitude calculable on lattice QCD within the framework of the large-momentum effective theory. We calculate the one-loop perturbative contributions to LCDA and quasi-distribution amplitudes and explicitly demonstrate the factorization of quasi-distribution amplitudes at the one-loop level. Based on the perturbative results, we derive the matching kernel in the MSbar scheme and regularization invariant momentum-subtraction scheme. Our result provides a first step to obtaining the LCDA from first principle lattice QCD calculations in the future.

Speaker: Dr Jun Zeng (Shanghai Jiao Tong University)

曾军.pdf

40 Black Hole Hyperaccretion in Collapsars: GRB Timescale

Gamma-ray bursts (GRBs) are classified into long and short populations (i.e., LGRBs and SGRBs) based on the observed bimodal distribution of duration T90. Multimessenger observations indicate that most SGRBs and LGRBs should be powered by ultrarelativistic jets launched from black hole (BH) hyperaccretion in compact-object mergers and massive collapsars, respectively. However, the duration criterion sometimes cannot correctly reflect the physical origin of a particular GRB. In the collapsar scenario, a GRB can be observed when the jet breaks out from the envelope and circumstellar medium successfully. The observed GRB duration reflects only the time the engine operates after the jet breaks out. This work studies the propagation of jets driven by the neutrino annihilation or Blandford–Znajek mechanism in massive collapsars. The signatures of the progenitors producing LGRBs, SGRBs, and failed GRBs in the collapsar scenario are exhibited. The competition between the mass supply onto the BH hyperaccretion and jet propagation into the envelope is definitely dependent on the density profiles of the collapsars. We show that duration and isotropic energy of GRBs can help constrain the density profiles of collapsars. Finally, we propose that a collapsar-origin SGRB, GRB 200826A, might originate from a neutrino-annihilation-dominated jet launched by a ~10 solar mass collapsar whose progenitor’s envelope has been stripped.

Speaker: Yunfeng Wei (Xiamen University)

Yunfeng Wei.pdf

41 Lepton Colliders and Study of Neutrino CP violation

As known neutrino oscillation is one the most important problems beyond standard model physics. Its observations enable us to infer that neutrinos have masses, although tiny. Another crucial problem within neutrino physics is the violation of Charge and Parity conservation, or namely CP violation. Here in our proposal we examine possible sensitivity on CP violating phase through oscillation mdoes of $\nu_{\mu}$, $\nu_e$ and their antineutrinos into tau neutrino. Interfacing with long baseline neutrino detectors such as DUNE or T2K, this proposal can be used to measure CP violating phase, $\delta_{\rm CP}$ and also serve as bright $\tau_{\nu}$ factory. The symmetric muon and anti-muon beams produces symmetric neutrino and anti-neutrino sources and importantly, signals for neutrino and antineutrino oscillation can be collected simultaneously. With rich flux of muon sources, 5σ deviations of sensitivity can be easily reached for CP phase as |π/2|, within only 1-2 years of data taking.

Speaker: Alim Ruzi (Peking University)

Alim_Ruzi--MuonWorkshop-SJTU.pdf

42 Production and attenuation of cosmic-ray boosted dark matter

Light sub-GeV halo dark matter (DM) particles up-scattered by high-energy cosmic-rays (CRs) (referred to as CRDM) can be energetic and become detectable by conventional DM direct detection experiments. We perform a refined analysis on the exclusion bounds of the spin-independent DM-nucleon scattering cross section $\sigma_{\chi p}$ in this approach. For the exclusion lower bounds, we determine the parameter of the effective distance $D_\rm{eff}$ for CRDM production using spatial-dependent CR fluxes and including the contributions from the major heavy CR nuclear species. We obtain $D_{\rm eff} \approx 9$ kpc for CRDM particles with kinetic energy above $\sim 1$ GeV, which pushes the corresponding exclusion lower bounds down to $\sigma_{\chi p} \sim 4 \times 10^{−32} \text{ cm}^2$ for DM particle mass at MeV scale and below. For the exclusion upper bounds from Earth attenuation, previous estimations neglecting the nuclear form factor leaded to typical exclusion upper bounds of $\sigma_{\chi p} \sim \mathcal{O}(10^{−28}) \text{ cm}^2$ from the XENON1T data. Using both the analytic and numerical approaches, we show that for CRDM particles, the presence of the nuclear form factor strongly suppresses the effect of Earth attenuation. Consequently, the cross section that can be excluded by the XENON1T data can be a few orders of magnitude higher, which closes the gap in the cross sections excluded by the XENON1T experiment and that by the astrophysical measurements such that for the cosmic microwave background (CMB), galactic gas cloud cooling, and structure formation, etc.

Speaker: Dr Chen Xia (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)

poster-TOPAC2023-XiaChen(2).pdf

43 Exploring Mirror Twin Higgs Cosmology with Present and Future Weak Lensing Surveys

We explore the potential of precision cosmological data to study non-minimal dark sectors by updating the cosmological constraint on the mirror twin Higgs model (MTH). The MTH model addresses the Higgs little hierarchy problem by introducing dark sector particles. In this work, we perform a Bayesian global analysis that includes the latest cosmic shear measurement from the DES three-year survey and the Planck CMB and BAO data. In the early Universe, the mirror baryon and mirror radiation behave as dark matter and dark radiation, and their presence modifies the Universe's expansion history. Additionally, the scattering between mirror baryon and photon generates the dark acoustic oscillation process, suppressing the matter power spectrum from the cosmic shear measurement. We demonstrate how current data constrain these corrections to the $\Lambda$CDM cosmology and find that for a viable solution to the little hierarchy problem, the proportion of MTH dark matter cannot exceed about $30\%$ of the total dark matter density, unless the temperature of twin photon is less than $30\%$ of that of the standard model photon. While the MTH model is presently not a superior solution to the observed $H_0$ tension compared to the $\Lambda$CDM+$\Delta N_{\rm eff}$ model, we demonstrate that it has the potential to alleviate both the $H_0$ and $S_8$ tensions, especially if the $S_8$ tension persists in the future and approaches the result reported by the Planck~SZ~(2013) analysis. In this case, the MTH model can relax the tensions while satisfying the DES power spectrum constraint up to $k < 10~h\rm{Mpc}^{-1}$. If the MTH model is indeed accountable for the $S_8$ and $H_0$ tensions, we show that the future China Space Station Telescope (CSST) can determine the twin baryon abundance with a $10\%$ level precision.

Speaker: Chi Zhang (Purple Mountain Observatory)

poster_MTH.pdf

44 Light Fermionic Dark Matter Absorption on Electron Targets

The direct detection of light dark matter (DM) is a big challenge. The kinetic energy of halo light DM is so small that the energy transfer through elastic scattering with nuclei can hardly exceed the detection threshold. In addition to using electron target, one possible way of overcoming this difficulty is fermionic DM absorption. Being converted to a massless neutrino, the light DM releases all its mass into energy for the final-state neutrino and electron. Even O(10)keV DM can already leave large enough electron recoil energy, thanks to the efficient mass conversion to energy. It also gives a unique signal with clear peak in the electron recoil spectrum whose shape is largely determined by the atomic effects. Terrestrial direct detection experiments, such as PandaX-II and Xenon1T, can be sensitive to this absorption signal. In addition, the DM overproduction, its invisible and visible decay effects on the cosmological evolution and the astrophysical X(gamma)-ray are thoroughly explored to give up-to-date constraints. Recently, the PandaX group uses the latest result with 0.63 tonne-year exposure from Panda-4T to put a stringent constraint. The result gives the first DM direct detection probe whose sensitivity already exceeds the indirect ones from astrophysical and cosmological observations, especially in the mass range from 25 to 45 (35 to 50) keV for an axial-vector (vector) interaction, respectively. This talk will elaborate the direct and indirect searches for this unique scenario of fermionic DM absorption on electron targets, including the second quantization treatment of the atomic effects.

Speaker: Jie Sheng (Shanghai Jiao Tong University, Tsung-Dao Lee Institute)

2023-TOPAC-poster-盛杰.pdf

45 Improving CP Measurement with Muon Decay At Rest

We explore the possibility of using the recently proposed THEIA detector to measure the $\bar \nu_\mu \rightarrow \bar \nu_e$ oscillation with neutrinos from a muon decay at rest ($\mu$DAR) source to improve the leptonic CP phase measurement. Due to its intrinsic low-energy beam, this $\mu$THEIA configuration ($\mu$DAR neutrinos at THEIA) is only sensitive to the genuine leptonic CP phase $\delta_D$ and not contaminated by the matter effect. With detailed study of neutrino energy reconstruction and backgrounds at the THEIA detector, we find that the combination with the high-energy DUNE can significantly reduce the CP uncertainty, especially around the maximal CP violation cases $\delta_D = \pm 90^\circ$. Both the $\mu$THEIA-25 with 17 kt and $\mu$THEIA-100 with 70 kt fiducial volumes are considered. For DUNE + $\mu$THEIA-100, the CP uncertainty can be better than $8^\circ$.

Speaker: Chuifan Kong

poster_ChuiFan_Kong.pdf

46 Bootstrapping One-loop Inflation Correlators with the Spectral Decomposition

Phenomenological studies of cosmological collider physics in recent years have identified many 1-loop inflation correlators as leading channels for discovering heavy new particles around or above the inflation scale. However, complete analytical results for these massive 1-loop correlators are currently unavailable. In this work, we embark on a program of bootstrapping inflation correlators with massive exchanges at 1-loop order, with the input of tree-level inflation correlators and the techniques of spectral decomposition in dS. As a first step, we present for the first time the complete and analytical results for a class of 4-point and 3-point inflation correlators mediated by massive scalar fields at the 1-loop order. Using the full result, we provide simple and reliable analytical approximations for the signals and the background in the squeezed limit. We also identify configurations of the scalar trispectrum where the oscillatory signal from the loop is dominant over the background.

Speaker: Hongyu Zhang

1.Poster_张洪语.pdf

47 Inflation Correlators at Tree and Loop Levels

During cosmic inflation, massive particles can be spontaneously produced due to quantum fluctuations, leaving imprints in the correlator of (nearly) massless inflaton fluctuations. Information about physics at the inflation scale is then encoded in such inflation correlators and is hopefully recovered by future cosmic observations. However, our understanding of inflation correlators is very limited compared to their Minkowskian counterparts, namely the scattering amplitudes in flat spacetime. In recent years, several methods are developed for the analytic calculations of inflation correlators, including the partial Mellin-Barnes representation and a modified version of cosmological bootstrap. For tree-level processes, full results of 4pt correlators are derived. We also obtain new closed-form results for 3pt and 2pt correlators via bootstrap equations. At the loop level, we derived a factorization theorem and a cutting rule using the partial Mellin-Barnes representation. With the factorization theorem, we calculate the nonlocal signals (nonanalytic parts) of typical 1-loop processes.

Speaker: Zhehan Qin (Tsinghua University)

PosterTOPAC_秦哲涵.pdf

48 Searching for high-frequency axion in quantum electromagnetodynamics through interface haloscopes

The so-called Witten effect implies a close relationship between axion and magnetic monopole. A sound quantization in the presence of magnetic monopoles, called quantum electromagnetodynamics (QEMD), was utilized to construct a more generic axion-photon Lagrangian in the low-energy axion effective field theory. This generic axion-photon Lagrangian introduces the interactions between axion and two four-potentials, and leads to new axion-modified Maxwell equations. The interface haloscopes place an interface between two electromagnetic media with different properties and are desirable to search for high-mass axions $m_a\ge \mathcal{O}(10)~\mu{\rm eV}$. In this work, for the generic axion-photon couplings built under QEMD, we perform comprehensive calculations of the axion-induced propagating waves and energy flux densities in different interface setups. We also obtain the sensitivity to new axion-photon couplings for high-mass axions.

Speaker: 昌杰 代 (Nankai University)

poster by dai chang jie.pdf

49 A global analysis for determined and undetermined hadronic two body weak decays of anti-triplet charmed baryons

Speaker: 飞 黄 (SJTU)

fei_huang_hpf.pdf

50 Ξc-Ξ′cmixingFromLatticeQCD

Speaker: 航 刘 (sjtu)

sjtu2023_Liu.pdf

51 Electronweak baryogensis and electron EDM in the lleft-right supersymmetric model

It would be natural to imagine that both the particle and antiparticle equally exist in the Universe. However, looking around our Universe, everything is made of the particle.No one knows why only the particle is left in the current Universe, which is one of the mysteries our Universe holds.
Electroweak baryogenesis (EWB) and electric dipole moment (EDM) have close relation with the new physics beyond the standard model (SM), because the SM CP-violating (CPV) interactions are not sufficient to provide the baryon asymmetry of the universe by many orders of magnitude, and the theoretical predictions for the EDM of electron in the SM are too tiny to be detected in near future.

Speaker: 怀聪 胡

poster hu.pdf

52 Dark Matter Freeze-out via Catalyzed Annihilation

We present a new paradigm of dark matter freeze-out, where the annihilation of dark matter particles is catalyzed. We discuss in detail the regime that the depletion of dark matter proceeds via $2\chi \to 2A'$ and $3A' \to 2\chi$ processes, in which $\chi$ and $A'$ denote dark matter and the catalyst respectively. In this regime, the number density of dark matter decreases in power-law before freeze-out, rather than an exponential decrease due to Boltzmann suppression, as is the case with classical WIMPs and SIMPs. The paradigm applies for a secluded weakly interacting dark sector with a dark matter in the $\mathrm{MeV-TeV}$ mass range. It is consistent with constraints from both the Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN), and it predicts enhanced signals for indirect detection.

Speaker: Chuan-Yang Xing

邢传阳.pdf

53 Scalarization by matter effect around black hole mimickers

Various theories predict the existence of light scalar particles. When considering the finite temperature and density corrections to the scalar potential, scalar fields can be sourced by a variety of stellar objects and mediate additional long-range scalar forces. Since the scalar field is only sourced in certain environments, this provides a complementary way to probe the parameter space compared to the fifth force constraints. In this study, we investigate the possibility of sourcing a light scalar field from various stellar objects through finite temperature and density effects. Particularly, we consider horizonless ultracompact object, 2-2-holes, an interesting candidate of black hole mimickers. Their interiors feature trans-Planckian temperature and ultra-high density, providing an extreme environment for generating this phenomenon. For the simple scalar model considered, we find that the scalar charge of ordinary star is extremely small in the allowed parameter space, while it could be large for 2-2-hole for certain types of scalar models. The induced force and scalar radiation could be detected by gravitational wave observations of binaries formed by 2-2-holes.

Speaker: Ximeng (西蒙) Li (李) (Institute of High Energy Physics)

LiXimeng_poster_IHEP.pdf

54 Type-II seesaw triplet scalar effects on neutrino trident scattering

Speaker: Ming-Wei Li (Tsung-Dao Lee Institute)

李明蔚.pdf

Saturday, 3 June

Neutrino

Conveners: Junjie Cao, Zhi-zhong Xing (Institute of High Energy Physics, Chinese Academy of Sciences)

55 Neutrino Physics with PandaX

Large liquid xenon Time Projection Chambers (TPC) with multi-ton of active mass, such as PandaX-4T, are becoming a powerful tool for neutrino physics. The detector has 350 kg of Xe-136 and can be used to precisely measure the double beta decay spectrum and search for neutrinoless double beta decay (NLDBD). PandaX-4T also has a large amount of another NLDBD candidate isotope, Xe-134 for related searches. As a large, low-background, low-threshold detector, PandaX-4T can detect solar neutrinos, including those from pp chain and B-8 decays. We will present the detector performance at high energy and the physics potential to neutrino physics with PandaX.

Speaker: Ke Han (SJTU)

Neutrino-Physics-with-PandaX_KeHan.pptx

56 Vacuum stability limit from cosmological history

The vacuum stability problem is usually studied assuming that at zero temperature the universe is in the electroweak-breaking vacuum. This may not be the case, however, as seen by checking the evolution history of the early universe in theories beyond the Standard Model. In such models the transition to the electroweak-breaking vacuum may not be possible and/or the universe may have evolved into a different vacuum state. Consequently, it is necessary to analyze the cosmological history to obtain the correct vacuum stability limit. We reveal that the above situations exist even in the simplest singlet extension of the Standard Model, propose a general procedure to identify them, and delineate the parameter space where this happens. We find that checking cosmological history can provide a more stringent and sometimes computationally cheaper limit of vacuum stability on new physics models than the traditional method.

Speaker: Jin Min Yang (ITP, CAS, Beijing)

jmyang-talk.pptx

57 U(1)_{Y'} universal seesaw

Speaker: Pei-Hong Gu (Southeast University)

2023-06-03.pdf

58 Recent progress on neutrino astronomy and the TRIDENT project

With IceCube's discovery of an extragalactic diffuse neutrino flux and first identification of compelling evidence for corresponding sources, TXS0506+056 and NGC 1068, neutrino astronomy is at the tipping point for major breakthroughs. In this talk, I will give a brief overview on the current status of the nascent field of high-energy neutrino astronomy and then discuss the progress on the newly proposed next-gen neutrino telescope to be built in South China Sea -- the TRIDENT project.

Speaker: Prof. Donglian Xu (T D Lee Institute)

trident_topac2023.pdf

10:10 Break

Astro

Conveners: Wei Liao, Yumin Zhao (SJTU)

59 Possible detection of positrons from an accreting X-ray pulsar?

Insight-HXMT is China’s 1st X-ray astronomy satellite launched in 2017 and still working nominally in orbit. With its broad energy band (1-250 keV) and large effective area (about 400, 1000, 5000 cm^2 in three energy bands), it has been used to make many new discoveries with its observations on accreting X-ray pulsars, such as the highest energy cyclotron absorption features above 100 keV. Positrons are known to be produced in the Milky Way through some well-known mechanisms, however, unambiguous identifications of positron sources are still rare. In this talk, I will report the detection of a hard X-ray spectral component above 100 keV with the Insight-HXMT observations on an accreting X-ray pulsar with strong surface magnetic fields, on top of the cut-off powerlaw spectrum usually detected from such systems. This new spectral component can be modelled by the positronium continuum or electron-positron annihilation signals in a pair plasma.

Speaker: Shuang-Nan Zhang (Institute of High Energy Physics)

positronium-20230603(2).pptx

60 LHAASO and the Observation of the Brightest GRB 221009A

I’ll briefly introduce the LHAASO as an gamma ray astronomical experiment and its historic detection of the brightest GRB 221009A since GRB was discovered 60 years ago. Enormous number of photons are collected during the burst of 2000 seconds by LHAASO water Cherenkov detector array. This allows us to measure the complete afterglow in high energy band, including it silent period, onset, growth and decay phases. Before it is fading away, LHAASO has recorded a sudden reduction in fluence that indicates a “jet break”. All the detailed measurements reveal many interesting features that have not been detected before in the GRB investigation history.

Speaker: Zhen Cao

61 Progress on cosmic rays model and implicaitons on dark matter

Cosmic rays propagation makes important progress in recent years. The progress implies different dark matter properties from previously expected. In the new model, the antiproton flux fits the AMS data well and no contribution from dark matter is needed and severe constraints on the dark matter annihilation are gotten. In the new model, the dark matter explanation for positron exess is relaxed by smaller annihilaiton cross section and consistent with the constraints by gamma ray observation from Fermi-LAT.

Speaker: 效军 毕 (中科院高能所)

3.TDLee2023-bixj.pdf

62 Primordial Black Hole Dark Matter

TBA

Speaker: Prof. Qing-Guo Huang (ITP)

pbhDM_tdli2306.pdf

Lunch

Astro

Conveners: Hong-Hao Zhang, Prof. Yosuke Mizuno (TDLI / Shanghai Jiao Tong University)

63 Bumblebee Black Holes

After obtaining black hole solutions in the bumblebee gravity theory, we put constraints on theory parameters with Solar system observations, black hole images, and extreme mass ratio inspirals.

Speaker: Prof. Lijing Shao (Peking University)

20230603_bumblebeeBH_TOPAC_Lee_full.pdf

20230603_bumblebeeBH_TOPAC_Lee_simplified.pdf

64 Dark matter from hot big bang black holes

If the temperature of the hot thermal plasma in the Early Universe was within a few orders of magnitude of the quantum gravity scale, then the hoop conjecture predicts the formation of microscopic black holes from particle collisions in the plasma. These black holes may evaporate and produce the dark matter relic abundance observed today for a wide variety of dark matter masses. We study the production of dark matter in standard cosmology and in the scenario of low-scale quantum gravity such as large extra dimensions. In the former case black holes evaporate instantly, while in the latter case dark matter may accrete and become macroscopic, leading to rich phenomena in the late Universe.

Speaker: Ningqiang Song (Institute of Theoretical Physics, Chinese Academy of Sciences)

LED_PBH_TOPAC.pdf

65 Phase Transition and Gravitational Wave of Strongly Coupled Dark Sectors

We go beyond the state-of-the-art by combining first principal lattice results and effective field theory approaches as Polyakov Loop model to explore the nonperturbative dark deconfinement-confinement phase transition and the generation of gravitational-waves in a dark Yang-Mills theory. We further include fermions with different representations in the dark sector. Employing the Polyakov-NambuJona-Lasinio (PNJL) model, we discover that the relevant gravitational wave signatures are highly dependent on the various representations. We also find a remarkable interplay between the deconfinement-confinement and chiral phase transitions. In both scenarios, the future Big Bang Observer and DECIGO experiment have a higher chance to detect the gravitational wave signals.

Speaker: Zhi-Wei Wang (UESTC)

Zhi-Wei Wang's slides 20230603

66 An inter-galactic magnetic field strength of ∼4e-17 G inferred with GRB 221009A

The delayed GeV−TeV cascade emission from extragalactic TeV−PeV sources are regarded as an ideal probe of the inter-galactic magnetic fields. Recently, LHAASO has detected ~10 TeV emission of the extraordinary powerful GRB 221009A within ~2000 s after the burst. Here we report the detection of a ~400 GeV photon, without accompanying prominent low-energy emission, by Fermi-LAT in the direction of GRB 221009A with the time delay of 0.4 days. Such a hard spectrum can be generated from electromagnetic cascades initiated by early primary ~10 TeV photons in the intergalactic space. An inter-galactic magnetic field strength of BIGMF∼4e-17 G, comparable to limits from TeV blazars, can naturally account for the arrival time of the ~400 GeV photon as well as the HAWC non-detection. Such a strength will be stringently tested by the upcoming CTA.

Speaker: Qiang Yuan (Purple Mountain Observatory)

2023_TDLI_YuanQ.pdf

Neutrino

Conveners: Prof. Yufeng Li (IHEP), Zhen-hua Zhao (Liaoning Normal University)

67 Modular symmetry approach to lepton mixing

Modular symmetry is a promising approach to address the flavor structure of Standard model. I shall present the recent development on modular symmetry in this talk.

Speaker: Gui-Jun Ding (University of Science and Technology of China)

modular_symmetry_approach_to_flavor_mixing.pdf

68 Testing lepton number violation beyond the approach of EFTs

In this talk, I will discuss the test of lepton number violation beyond the approach of effective field theories. In the UV completion, one can study LNV interactions with neutrinoless double beta decay, collider searches and low energies precision experiments complementarily.

Speaker: Gang Li (Sun Yat-sen University)

TOPAC2023_Gang_Li_v2.pdf

69 The Neutrino Magnetic Moment Portal and Supernovae: New Constraints and Multimessenger Opportunities

We scrutinize the hypothesis that gauge singlet fermions - sterile neutrinos - interact with Standard Model particles through the transition magnetic moment portal. These interactions lead to
the production of sterile neutrinos in supernovae followed by their decay into photons and active
neutrinos which can be detected at γ-ray telescopes and neutrino detectors, respectively. We find
that the non-observation of active neutrinos and photons from sterile-neutrino decay associated to
SN1987A yields the strongest constraints to date on magnetic-moment-coupled sterile neutrinos
if their masses are inside a 0.1 − 100 MeV window. Assuming a near-future galactic supernova
explosion, we estimate the sensitivity of several present and near-future experiments, including
Fermi-LAT, e-ASTROGAM, DUNE, and Hyper-Kamiokande, to magnetic-moment-coupled sterile
neutrinos. We also study the diffuse photon and neutrino fluxes produced in the decay of magneticmoment coupled sterile neutrinos produced in all past supernova explosions and find that the absence of these decay daughters yields the strongest constraints to date for sterile neutrino masses inside a 1 − 100 keV window.

Speaker: Yingying Li (USTC)

TDLI-SN-final.pdf

70 Status and Physics Prospects of JUNO experiment

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector currently being built in an underground laboratory in South China. The construction is expected to be completed by the end of 2023. JUNO will feature a remarkable energy resolution of 3% at 1 MeV, a large detector volume, and exceptional background control. With these advantages, JUNO will become a flagship experiment in the coming decades, primarily focused on determining the neutrino mass ordering, and precise measurements of the neutrino oscillation parameters using reactor antineutrinos. Additionally, JUNO’s versatility as a multi-purpose neutrino observatory, positions it as a strong contender in the searches for diffuse supernova neutrino background (DSNB), the core-collapse supernova (CCSN) neutrinos, solar neutrino, atmospheric neutrinos, geo-neutrinos, nucleon rare decays and other new physics beyond the Standard Model. This presentation will provide an update on the status of the JUNO experiment and the latest evaluations of JUNO’s physics goals.

Speaker: Jie （捷） Cheng （程） (North China Electric Power University)

TOPAC2023_JUNO_JieCheng.pdf

15:10 Break

Cosmo

Conveners: Prof. Lei Zhang (Nanjing University (CN)), Jason L Evans (SJTU/TDLI)

71 Dynamics of electroweak phase transitions and gravitational wave production from domain walls

Speaker: Yun Jiang

20230603_EWPT-DW-GW.pdf

72 粒子物理和早期宇宙对称性破缺

强一阶电弱相变为解释正反物质不对称提供了必要条件，宇宙弦和畴壁是很多大统一等新物理模型的普遍预言。它们是太极和天琴计划、 脉冲星计时阵列等的重要科学目标之一。我将在此报告中跟大家交流一下粒子物理模型与早期宇宙对称性破缺，及相应的随机引力波产出与探测方面的研究进展。

Speaker: Prof. Ligong Bian (Chongqing University)

对称性破缺相关新物理_0603v1.pptx

73 Freeze-in of WIMP dark matter

We propose a novel scenario for dark matter (DM) in which weakly interacting massive particles (WIMPs) can freeze-in due to a first-order phase transition (FOPT) in the early Universe. The FOPT dilutes the preexisting DM density to zero, and leads to a sudden change in DM mass that prevents WIMPs from re-equilibrating due to their large mass-to-temperature ratio. Following the FOPT, WIMPs are produced via a freeze-in process, even though their interactions are NOT feeble. We demonstrate this concept using a simplified model and then realize the scenario in a realistic model with a delayed electroweak phase transition. Our work extends the category of WIMP DM and opens up a new direction for the freeze-in mechanism.

Speaker: Prof. Ke-Pan Xie (Beihang University)

TOPAC2023.pdf

74 Anisotropies in the gravitational-wave background as a probe of ultralight boson dark matter

Massive scalar field around a Kerr black hole can induce superradiant instabilities, resulting in the formation of a boson cloud around the black hole. Since rotating stellar-mass black holes are ubiquitous in every galaxy, the gravitational waves (GWs) emitted by their associated boson clouds together constitute a stochastic background on the sky, if cosmological dark matter consists of ultralight bosons. Here we study the anisotropy signal of this GW background (GWB). We demonstrate that the GWB anistropies trace large-scale dark matter fluctuations and thus serve as an indirect probe of ultralight boson dark matter.

Speaker: Bohua Li (Guangxi University)

TOPAC23_Bohua_Li.pdf

SM/BSM

Conveners: Jiashu Niu, Xiaodong Ma

75 Semileptonic Heavy-Hadron Decays in Quantum Chromodynamics

QCD aspects of exclusive heavy-hadron decays will be discussed with an emphasis on the perturbative factorization properties for the resulting hadronic matrix elements in the heavy quark expansion and on the systematic discussions of the distinct dynamical mechanisms governing the flavor-changing form factors beyond the leading-power approximation. Phenomenological implications of the technical improvements for evaluating the heavy hadron decay amplitudes will be further elaborated with a number of interesting exclusive processes accessible at the LHCb and Belle II experiments.

Speaker: Prof. Yu-Ming Wang (Nankai University)

Semileptonic heavy hadron decays.pdf

76 Explaining the CDF W-mass shift and (g-2)_\mu in a Z^\prime scenario and its implications for the b \to s \ell^+ \ell^- processes

In the past few years, several indirect hints for New Physics beyond the SM arose in precision measurements, e.g., $(g-2)_\mu$ and the W-boson mass. In this work, we consider a model containing new vector-like Fermion partner gauged under a new $U(1)'$ symmetry. It is found that the latest CDF $m_W$ measurement and $(g-2)_\mu$ can be simultaneously accommodated. We have also considered several other experimental constraints, including the neutrino trident production, $Z \to \mu \mu$ decay, dimuon resonance searches at the LHC, etc. Implications for the $b \to s \ell^+ \ell^-$ process will be discussed. (This work is based on 2205.02205 and some recent developments.)

Speaker: Prof. 袁 兴博 (Central China Normal University)

Yuan.pdf

77 Z boson mixing and the mass of the W boson

We explore the possibility of explaining the W boson mass with an extra gauge boson mixing with the Z boson at tree level. Extra boson mixing with the Z boson will change the expression of the Z boson mass, thus altering the W boson mass. We explore two models in this work. We find that in the derivative portal dark matter model there are parameter spaces which can give the observed W boson mass, as well as the observed dark matter, relic density. These parameters’ spaces can also fulfill the constraints from the electroweak oblique parameters and dark matter indirect detection. In the U(1) extension model, the kinetic mixing between extra boson and B boson can also give the observed W boson mass. However, to fulfill the electroweak oblique parameters’ fit, the kinetic mixing in the U(1) model can only contribute about 27 MeV extra mass to the Standard Model W boson mass. Both models indicate the extra vector boson with the best fit mass around 120 GeV.

Speaker: Yu-Pan Zeng (Guangdong Ocean University)

mW_beamer.pdf

78 A global analysis for determined and undetermined hadronic two body weak decays of anti-triplet charmed baryons

Speaker: zhi-peng Xing (TDLI)

su3.pdf

17:10 Break

Banquet

Sunday, 4 June

Collider

Conveners: Chengping Shen, Wei Wang

79 Recent updates of Higgs properties measurement in the ATLAS and CMS experiments

The Standard Model of particle physics has proven incredibly successful at describing many features of nature that we observe in our experiments. The Brout-Englert-Higgs mechanism that took place in the early Universe, less than a picosecond after the Big Bang, led to the electromagnetic and the weak interactions becoming distinct in their actions. In the SM, this mechanism introduces a complex scalar field that permeates the entire Universe. Its quantum manifestation, the Higgs Boson, was observed by the ATLAS and CMS experiments at the Large Hadron Collider in 2012. 10 years after the Higgs Boson discovery, its properties have been measured at good precision. Higgs self-coupling strength, which has profound implications on the mechanism of the electroweak phase transition the universe underwent shortly after the Big Bang and on the ultimate fate of the universe itself, has also been determined via single Higgs plus di-Higgs combination. In this talk, I will present recent updates of Higgs properties measurement in the ATLAS and CMS experiments.

Speaker: Kun LIU (TDLI/SPA, SJTU)

HiggsUpdates2023.pdf

80 Symbol Letters of Feynman Integrals

In this talk, I introduce some recent developement in the construction of symbol letters of Feynman integrals using Baikov representations and intersection theory.

Speaker: Lilin Yang

2023-06-04 TDLi TOPAC.pdf

81 Dark Photon search at SHINE facility

Dark SHINE is a new initiative to search for Dark Photon invisible decays into light dark matter particles utilizing the high repetition rate single electron beam to be deployed at the SHINE facility. This talk will show the Dark SHINE project in general and moreover the related BSM searches for Dark Photon at selected experiments at the energy and intensity frontiers.

Speaker: Shu Li (TDLI, SJTU)

DarkSHINE-20230604.pptx

82 Nuclear decay anomalies as a signature of axion dark matter

A number of nuclear decay anomalies have been reported in the literature, which purport to show periodic variations in the decay rates of certain radioisotopes. If these reports reflect reality, they would necessitate a seismic shift in our understanding of fundamental physics. We provide the first mechanism to explain these findings, via the misalignment mechanism of QCD axion dark matter, wherein oscillations of the effective $\theta$ angle induce periodic variation in nuclear binding energies and hence decay rates. As we expect this effect to be most pronounced in low-$Q$ systems, we analyse 12 years of tritium decay data ($Q\simeq$ 18.6 keV) taken at the European Commission's Joint Research Centre. Finding no statistically significant excess, we exclude axion decay constants below $9.4\times10^{12} - 1.8\times10^{10}$ GeV (95 \% confidence level) for masses in the $1.7\times{10}^{-23} - 8.7\times 10^{-21}$ eV range.

Speaker: Tianjun Li (Institute of Theoretical Physics, Chinese Academy of Sciences)

TDLeeInstitute-2023.pdf

10:10 Break

Collider

Conveners: Jiayin Gu (Fudan University), Kai Yan (Shanghai Jiao Tong University)

83 Precision test of the Zbb anomalous couplings at colliders

The forward-backward asymmetry data for the bottom quark at LEP is in conflict with predictions from the standard model, and has been an unresolved issue for some time. It is important to address this discrepancy in order to conduct tests of both the standard model and any proposed theories beyond it. This presentation will provide an overview of recent efforts to investigate anomalous couplings in Zbb interactions at colliders, with the potential to either confirm or discount the LEP data and ultimately solve the $A_{\rm FB}$ mystery at upcoming events such as the LHC and EIC.

Speaker: Prof. Bin Yan (IHEP)

Zbb_BY.pdf

84 Probing EWPT in 2HDM with LHC and Future Lepton Colliders

tudying the properties of Standard Model (SM) – like Higgs boson becomes one important window to explore the physics beyond the SM. In our works, we present studies about the implications of the Higgs and Z-pole precision measurements at current LHC and future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95% C.L. constraints on the model parameter spaces of Two Higgs Double Model (2HDM). In the 2HDM, we analyse tree level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on cos(β − α), mΦ and heavy Higgs mass splitting can be complementary to direct search of the LHC and Z pole precision measurements. Our works also scrutinize the relationship between SFOPT required by baryogenesis and SM-Higgs coupling deviation at LHC and future lepton colliders.

Speaker: Wei Su (SYSU)

20230601TDLi_WeiSu.pdf

85 Interpretable machine learning in HEP analysis

Machine learning methods have proved powerful in particle physics, but without interpretability there is no guarantee the outcome of a learning algorithm is correct or robust. Thus the interpretable machine learning (IML) framework become necessary in the HEP large data era. I am demonstraintg how the IML framework can be achieved with detailed analysis on a few LHC processes as example, and explaining further application and interpretation concepts.

Speaker: Zhuoni Qian (Hangzhou Normal University)

202306_SHJT.pdf

86 Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning

In this work, by using machine learning methods, we study the sensitivities of heavy pseudo-Dirac neutrino $N$ in the inverse seesaw at the high-energy hadron colliders. The production process for the signal is $pp \to \ell^\pm N \to 3 \ell + E_T^{\rm miss}$, while the dominant background is $p p \to W^\pm Z \to 3 \ell + E_T^{\rm miss}$. We use either the Multi-Layer Perceptron or the Boosted Decision Tree with Gradient Boosting
to analyze the kinematic observables and optimize the signal/background discrimination. It is found that the reconstructed $Z$ boson mass and heavy neutrino mass from the charged leptons and missing transverse energy play crucial roles to separate the signal/background events. We estimate the prospects of heavy-light neutrino mixing $|V_{\ell N}|^2$ (with $\ell = e,\,\mu$) using machine learning at the hadron colliders with $\sqrt{s}=14$ TeV, 27 TeV, and 100 TeV, and find that $|V_{\ell N}|^2$ can be improved up to ${\cal O} (10^{-6})$ for heavy neutrino mass $m_N = 100$ GeV and ${\cal O} (10^{-4})$ for $m_N = 1$ TeV.

Speaker: Jie Feng (Sun Yat-sen University (CN))

Heavy_N_TOPAC2023.pdf

GW

Conveners: Wenbiao Han, Yunlong Zhang (USTC)

87 Search for Primordial Non-Gaussianity with Cosmological Gravitational Wave Background

The search for primordial non-Gaussianity is an important probe of the early universe and can provide valuable information about the physics of inflation. I will discuss the possibility of measuring primordial non-Gaussianity through space-borne measurements of the cosmological gravitational wave background. We focus on the scalar non-Gaussianity generated during inflation, which can leave an imprint on the induced gravitational wave background. We show that by measuring the auto-correlation function of the induced gravitational wave background, it is possible to constrain the amount of scalar non-Gaussianity present in the early universe. We will also discuss the impact of various astrophysical and instrumental effects on the measurement of primordial non-Gaussianity, and show that future space-based gravitational wave detectors such as LISA and DECIGO/BBO have the potential to significantly improve our understanding of the early universe.

Speaker: Prof. Sai Wang (IHEP, CAS)

Sai_Wang_IHEP_CAS.pptx

88 Tests of modified gravitational wave propagations

The direct discovery of gravitational waves (GWs) from the coalescence of compact binary components by the LIGO/Virgo/KAGRA Collaboration provides an unprecedented opportunity for exploring the underlying theory of gravity. The gravitational waves, after their generation, will be propagating at cosmological distances before they are detected and can provide invaluable information on the nature of gravity that drives their propagation. In this talk, I will briefly review the universal parameterized framework for describing the possible modified gravitational wave propagation in modified gravities and their signatures in the gravitational waveforms. And then discuss how to test them with signals of gravitational waves detected by LIGO/Virgo/KAGRA detectors.

Speaker: Prof. Tao Zhu (Zhejiang University of Technology)

20230604浙江工业大学朱涛.pdf

89 SO(10)大统一理论中的费米子质量、重子生成和引力波

大统一理论旨在统一电磁、强和弱三种基本相互作用。其经典预言是质子衰变。目前尚未发现质子衰变的迹象，这对大统一能标带来较强的限制。在SO(10)大统一理论中，由于标准模型费米子都是安排在一个不可约表示下，夸克和轻子的质量与味混合是相互关联的。伴随着中微子实验进入精确测量时代，来自费米子味混合的实验数据对大统一的限制开始逐渐被慎重对待。此外，SO(10)大统一模型还可以产生宇宙弦并辐射出引力波，这使得我们还可以从宇宙学观测的角度去认识大统一理论。我将讨论上面提及的不同类型的实验限制，并给出目前符合所有实验数据的大统一模型。

Speaker: Ye-Ling Zhou (HIAS-UCAS)

TOPAC2306_YLZ.pdf

90 Muonphilic dark matter explanation of gamma-ray galactic center excess

The Galactic center gamma-ray excess (GCE) is a long-standing unsolved problem. One of candidate solutions, the dark matter (DM) annihilation, has been recently tested with other astrophysical observations, such as AMS-02 electron-positron spectra, Fermi Dwarf spheroidal galaxies gamma-ray data, and so on. By assuming that the DM particles annihilate purely into a normal charged fermion pair, Di Mauro and Winkle (2021) claimed that only a muon-pair is compatible with the null detection of all the corresponding astrophysical measurements and can explain GCE simultaneously. On the other hand, a muonphilic DM model may also lead to a signal in the recent Fermilab muon g−2 measurement or be constrained by the latest PandaX-4T limit. In this work, we comprehensively study interactions between DM and muon, including various combinations of DM and mediator spins. In agreement with GCE (not only 2μ but also 4μ final states), we test these interactions against all the thermal DM constraints. Our results show that only the parameter space near the resonance region of mediator can explain GCE and relic density simultaneously, and larger parameter spaces are still allowed if other poorly-known systematic uncertainties are included. Regardless of the DM spin, only the interactions with the spin-0 mediator can explain the recent muon g−2 excess on top of GCE, relic density, and other DM and mediator constraints.

Speaker: Prof. Chih-Ting Lu (Nanjing Normal University)

CTLu_Muonphilic_DM_TOPAC2023.pdf

Lunch

GW

Conveners: Liewen Chen (SJTU), Xiao Gang He (Shanghai Jiao Tong University, Tsung-Dao Lee Institute)

91 Extreme mass ratio inspirals

Extreme mass ratio inspirals (EMRIs) are among the
most promising sources for space-based gravitational wave detectors. For EMRIs, the small compact object spends the last few years inspiralling deep inside the strong gravitational field around the massive BH with a highly relativistic speed. The emitted GWs from EMRI/IMRI encode rich information about the spacetime geometry around the MBH and the environment of the host galaxy, so they can be used to confirm whether the MBH is a Kerr BH predicated by GR. In this talk, I will talk about the probe of scalar and vector charges carried by the secondary BHs in EMRIs with space-based gravitational wave detector.

Speaker: Yungui Gong (Huazhong University of Science and Technology)

EMRI_charge.pptx

92 Gravitational waves from phase transitions during inflation

Due to the large excursion of the inflaton field. The parameters, such as mass and couplings of the fields coupled to the inflaton field, may change dastically during inflation. And thus phase transitions may be induced. In this talk, I am going to discuss the gravitational wave signals produced by phase transitions during inflation. For first-order phase transitions, I will show that the gravitational wave spectrum has a unique oscillation feature. For second-order phase transitions, I will show that topological defects produced during the phase transition will produce detectable gravitational waves.

Speaker: Prof. Haipeng An (Tsinghua University)

TDLI2023_HaipengAN.pdf

93 Particle cosmology at TianQin

We systematically discuss the deep connection between TianQin and the fundamental problems in particles cosmology, including the gravitational wave detection of dark matter, electroweak baryogenesis and so on.

Speaker: Fa Peng Huang (Sun Yat-sen University)

particlecosmologyattianqin.pdf

94 暗物质间接探测进展及中子星内部的夸克物质

暗物质与夸克物质是两类极端物态，前者的物理本质尚不清楚，后者是否能够在中子星内部存在也是一个前沿科学问题。报告中我将介绍近几年暗物质间接探测的相关研究进展，对一些候选疑似信号进行重点讨论；我还将介绍现阶段基于多信使数据的中子星物态方程的研究，特别是关于最重的中子星内部存在夸克物质的可能性。

Speaker: Mr 一中 范 (紫金山天文台)

Dark matter and quark matter.pptx

Closing

Convener: Xiao Gang He (Shanghai Jiao Tong University, Tsung-Dao Lee Institute)