Conveners
Theory: QCD (1)
- Haitao Li (haitao.li@sdu.edu.cn)
Theory: BSM (1)
- Bin Yan (IHEP)
Theory: BSM (2)
- Shao-Feng Ge (TDLI-SJTU)
Theory: QCD (2)
- Dingyu Shao
Theory: EFT/EW
- Jun Gao
Theory: Higgs/EWPT
- Gang Li (Sun Yat-Sen University)
Theory: Heavy Flavor
- Xiaoping Wang (Beijing University)
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Dingyu Shao (Fudan University)16/11/2023, 14:00
We present a systematic formalism based on a factorization theorem in soft-collinear effective theory to describe non-global observables at hadron colliders, such as gap-between-jets cross sections. The cross sections are factorized into convolutions of hard functions, capturing the dependence on the partonic center-of-mass energy, and low-energy matrix elements, which are sensitive to the low...
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Dr Long Chen (Shandong University)16/11/2023, 14:20
In this talk we will discuss the recent processes in the calculation of the high-order perturbative corrections to the semi-inclusive production and decay of top quarks at lepton colliders at N3LO in QCD. In particular, the talk will be focusing on the first high-precision calculation of the complete QCD corrections to the top-quark decay width $\Gamma_t$, $W$-helicity fractions and...
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Hang Liu16/11/2023, 14:40
In heavy quark limit, the lowest-lying charmed baryons with two light quarks can form an SU(3) triplet and sextet. The $\Xi_c$ in the SU(3) triplet and $\Xi_c'$ in the sextet have the same $J^{PC}$ quantum number and can mix due to the finite charm quark mass and the fact the strange quark is heavier than the up/down quark. We explore the $\Xi_c$-$\Xi_c'$ mixing by calculating the...
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Yao Fu (University of Science and Technology of China)16/11/2023, 15:00
The resummation calculation (ResBos) is a widely used tool for the simulation of single vector boson production at colliders. As the improvement over the ResBos code by increasing the accuracy from NNLL+NLO to N$^3$LL+NNLO, the nonperturbative function needs to be updated. We propose a new non-perturbative function (IFY) that includes information about the rapidity of the system. The IFY...
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Mr Minhuan Chu (Shanghai Jiao Tong University)16/11/2023, 15:20
We present a first lattice QCD calculation of the transverse-momentum-dependent wave functions (TMDWFs) of the pion using large-momentum effective theory. Numerical simulations are based on one ensemble with 2+1+1 flavors of highly improved staggered quarks action with lattice spacing a = 0.121 fm from the MILC Collaboration, and one with 2 +1 flavor clover fermions and tree-level Symanzik...
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重阳 刘 (上海交通大学粒子物理与核物理研究所)16/11/2023, 15:40
We present
Go to contribution pageFMNLO, a framework to combine general-purpose Monte Carlo generators and fragmentation functions (FFs). It is based on a hybrid scheme of phase-space slicing method and local subtraction method, and accurate to next-to-leading order (NLO) in QCD. The new framework has been interfaced toMG5_aMC@NLOand made publicly available in this work. We demonstrate its unique ability by... -
Cong-Feng QIAO (UCAS)16/11/2023, 16:20
We study the feasibility of observing sterile neutrino at the high energy colliders, using direct and indirect production channels in heavy meson/baryon and Higgs decays. It is found that these processes may set certain new constraints on the mass of sterile netrino in present running and next generation experiments.
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Prof. Luca Visinelli (Shanghai Jiao Tong University)16/11/2023, 16:40
The physics beyond the Standard Model (BSM) could be represented by a hidden sector at relatively low energy scales MeV-GeV and feeble couplings to SM. Their presence in our Universe would be revealed through indirect evidences such as small oscillations of SM parameters, cosmological and astrophysical considerations, and the complementary searches in accelerators. Here, I give an overview of...
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Yuxuan He (Peking University)16/11/2023, 17:00
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Jinhui Guo (Peking University)16/11/2023, 17:20
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Yuan-Zhen Li16/11/2023, 17:40
It is important to understand the implications of current observational constraints and potential signatures on the thermal history of dark matter. Using the freeze-in/-out scenarios as templates, we revisit dark-matter production by solving the Boltzmann equations at the level of the phase-space distribution. We also investigate the current Lyman-alpha constraints on mass of the dark matter...
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Jiang Zhu (TDLI)16/11/2023, 18:00
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21. $B$ meson anomalies and large $B^{+}\to K^{+}\nu\bar{\nu}$ in non-universal $U(1)^\prime$ modelsCRISTIAN FELIPE SIERRA FONSECA (Nanjing Normal University)17/11/2023, 14:00
In view of both the latest LHCb measurement of $R_{K^{(*)}}$ and the new $2.8\sigma$ deviation reported by Belle II on $B^{+}\to K^{+}\nu\bar{\nu}$ decays, we present a fit to the $B$ meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal $U(1)^{\prime}$ extensions of the SM,...
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Ruiqing Xiao17/11/2023, 14:20
We study probes of neutral triple gauge couplings (nTGCs) at the LHC, CEPC and SPPC. The nTGCs provide a unique window to the new physics beyond the Standard Model (SM) because they can arise from SM effective field theory (SMEFT) operators that respect the full electroweak gauge group $\mathrm{SU(2)}_{\mathrm L}^{}\!\otimes\mathrm{U(1)}_{\mathrm Y}^{}$ of the SM only at the level of...
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Prof. Chih-Ting Lu (Nanjing Normal University)17/11/2023, 14:40
In this talk, we explore the potential of probing the inelastic dark matter (DM) model with an extra $U(1)_D$ gauge symmetry at the Large Hadron Collider, ForwArd Search ExpeRiment and Super Tau Charm Factory. To saturate the observed DM relic density, the mass splitting between two light dark states has to be small enough, and thus leads to some distinctive signatures at these colliders. By...
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zhi-peng Xing (njnu)17/11/2023, 15:00
A new $U(1)_X$ gauge boson field X can have renormalizable kinetic mixing with the standard model (SM) $U(1)_Y$ gauge boson field Y. Besides the dark photon kinetic mixing $\sigma$, there could be mass mixing by introducing the additional Higgs doublet with vev engaging in $U(1)_X$ and electroweak symmetry breaking simultaneously. The Z boson interaction with SM tau lepton is...
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Yufei Zhang17/11/2023, 15:20
Future muon colliders with center-of-mass energy of $\mathcal{O}(1-10)$ TeV can provide a clean high-energy environment with advantages in searches for TeV-scale axion-like particles (ALPs), pseudo-Nambu–Goldstone bosons associated with spontaneously broken global symmetries, which are widely predicted in physics beyond the Standard Model (SM).
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We exploit ALP couplings to SM fermions, and... -
Yun Jiang (SYSU)17/11/2023, 15:40
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Prof. Shu-Yi WEI (Shandong University)17/11/2023, 16:20
The longitudinal spin transfer represents the probability density of producing longitudinally polarized hadrons from longitudinally polarized quarks or circularly polarized gluons. It thus was usually measured in polarized reactions or high-energy collisions where weak interaction dominates. In this work, we propose the dihadron polarization correlation as a novel probe of this quantity. Such...
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Jialu Zhang (上海交通大学)17/11/2023, 16:40
We develop a hybrid scheme to renormalize quasi distribution amplitudes of a light baryon on the lattice, which combines the self-renormalization and ratio scheme. By employing self-renormalization, the UV divergences and linear divergence at large spatial separations in quasi distribution amplitudes are removed without introducing extra nonperturbative effects, while making a ratio with...
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思宇 汤 (武汉纺织大学)17/11/2023, 17:00
The hard probes, including jets and heavy flavors, play an important role in investigating the properties of quark–gluon plasma (QGP) formed in heavy-ion collisions. The positive elliptic flow of hard probes observed in semi-central Pb--Pb collisions indicates that the hard partons suffered strong interactions in the deconfined QCD medium and then obtain the collectivity. However, recent...
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烨凡 王 (Shandong university)17/11/2023, 17:20
We present the first analytic results of N3LO QCD corrections to the top-quark decay width. We focus on the dominant leading color contribution, which includes light-quark loops. At NNLO, this dominant contribution accounts for 95% of the total correction. The most precise prediction for the top-quark width is now 1.321 GeV for mt = 172.69 GeV.
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Lianbao Jia17/11/2023, 17:40
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Jian-Nan Ding (Peking University)18/11/2023, 08:30
To probe new physics without prior assumptions on UV models, the correlation of operators could be crucial in exposing the structure of UV completion.
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When operators arise from the same heavy resonance, they are likely to correlate and their Wilson coefficients exhibit non-trivial relation, since both of them depend on the same UV parameters.
The aim of EFT analysis is to discover the... -
Chi Shu (Fudan University)18/11/2023, 08:50
By tagging one or two intact protons in the forward direction, it is possible to select and measure exclusive photon-fusion processes at the LHC. The same processes can also be measured in heavy ion collisions, and are often denoted as ultraperipheral collisions (UPC) processes. Such measurements opens up the possibility to probe certain dimension-8 operators and their positivity bounds at...
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袁 兴博 (CCNU)18/11/2023, 09:10
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 $U(1)^\prime$ symmetry. It is found that the latest CDF $m_W$ measurement and $(g-2)_\mu$ can be simultaneously accommodated. We have also considered...
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Rui Zhang (IHEP)18/11/2023, 09:30
Recently, the $W$ boson mass measured by the CDF-II collaboration shows large tension with the standard model prediction and other measurements. In this work, we look into the double parton scattering (DPS) contribution in CDF-II W mass measurement. We show that the DPS process can increase the measured mass as $\Delta M_W=20-200~\mbox{MeV}$ for the missing transverse momentum fit and $\Delta...
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郁涵 倪 (Institute of Theoretical Physics, Chinese Academy of Sciences)18/11/2023, 09:50
We organize massive tree-level amplitudes in Standard Model by power counting and helicity category, and match them with their high energy origins. The construction of massive amplitudes is based on the massive bootstrap method, decomposing internal and external structures, and the existing leading orders of massless-massive correspondence. For the matching of higher order components, we...
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成杰 杨 (高能物理研究所&理论物理研究所)18/11/2023, 10:10
We present MatchingEFT.jl, an automated tool to extract hard region contribution of the tree-level and one-loop 1PI amplitude, which can be matched to the standard model effective theory (SMEFT) operator basis in ABC4EFT.
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FeAnGen4EFT performs the feynman diagram generation for the specific scattering process using the designed universal feynrules output file (UFO) and Qgraf. It offers the... -
Yaoduo Wang (TDLI, SJTU)19/11/2023, 14:00
We investigate cosmological phase transitions in various composite Higgs models consisting of four-dimensional asymptotically-free gauge field theories. Each model may lead to a confinementdeconfinement transition and a phase transition associated with the spontaneous breaking of a global symmetry that realizes the Standard Model Higgs field as a pseudo-Nambu-Goldstone boson. Based on the...
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Guotao Xia (TDLI, SJTU)19/11/2023, 14:20
In this study, we use lattice to reveal nonperturbative information of the electroweak phase transition in the real-singlet extension of the Standard Model, based on the 2-loop 3D EFT framework.
Importantly, the new information is that the lattice determines the true nature of the electroweak phase transition, capable to identify it as the first order type or not, an important...
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仁晖 覃 (重庆大学)19/11/2023, 14:40
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Yanda Wu (TDLI, SJTU)19/11/2023, 15:00
In this study, we present a comprehensive analysis of the electroweak sphaleron formalism and its application to electroweak phase transition (EWPT) patterns in extensions of the Standard Model scalar sector with electroweak multiplets. We offer an equivalence proof for different choices for the form of sphaleron configurations; construct the previously unestablished high-dimensional...
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世豪 邓 (重庆大学)19/11/2023, 15:20
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Wenxing Zhang (SJTU)19/11/2023, 15:40
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Yan-bing Wei (BJUT)19/11/2023, 16:20
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Dr 亚兵 左 (辽宁师范大学)19/11/2023, 16:40
The form factors of $B_{(s)}$ decays into P-wave excited charmed mesons (including $D^*_0(2300)$, $D_1(2430)$, $D_1(2420)$, $D^*_2(2460)$ and their strange counterparts, denoted generically as $D^{**}_{(s)}$) are systematically calculated via QCD sum rules in the framework of heavy quark effective field theory (HQEFT). We consider contributions up to the next leading order of heavy quark...
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Yin-Fa Shen (HUST)19/11/2023, 17:00
We propose that the cascade decay $\Lambda_b \to D(\to K^+\pi^-) N(\to p\pi^-)$ may serve as the discovery channel for baryonic CP violation. This decay chain is contributed by dominantly the amplitudes with the intermediate $D$ state as $D^0$ or $\bar{D}^0$. The large weak phase between the two kinds of amplitudes suggests the possibility of significant CP violation. While the presence of...
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Duanyang Zhao (中山大学)19/11/2023, 17:20
CP4 3HDM is a three-Higgs-doublet model based on the CP symmetry of order 4 (CP4). Imposing CP4 leads to remarkable connections between the scalar and Yukawa sectors and unavoidably generates tree-level flavor-changing neutral couplings (FCNC). It remains unclear whether FCNC can be sufficiently suppressed in the CP4 3HDM. In this paper, we systematically explore this issue. We first develop...
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wen jie Song (华中科技大学)19/11/2023, 17:40
We propose a new kind of CP violation effect — the double-mixing CP asymmetry — in a type of cascade decays that involves at least two mixing neutral mesons in the decay chain. It is induced by the interference between different oscillation paths of the neutral mesons in the decay process. The double-mixing CP asymmetry is of critical importance for phenomenology, providing opportunities for...
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Dr Fei Huang (UJN)19/11/2023, 18:00
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Xining Wang (Tsinghua University)
A search is reported for near-threshold structures in the J/ψJ/ψ invariant mass spectrum produced in proton-proton collisions at √s = 13 TeV from data collected by the CMS experiment, corresponding to an integrated luminosity of 135 fb−1. A new structure is observed with a significance above 5 standard deviations at a mass of 6552 ± 10 (stat) ± 12 (syst) MeV. Another structure with even higher...
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Mr Xiaojie Jiang (IHEP(Beijing))
The Upstream Tracker is a key component of the LHCb updating. Based on silicon strip sensors, the UT will contribute to efficient and high-speed track reconstruction. UT's installation is a long-term and challenging work. Fortunately, the installation of UT is compeleted earlier this year. It also passed many kinds of electronics and service tests. The details of installation and pre-tests for...
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Zhenwu Ge (Nanjing University)
The High Granularity Timing Detector (HGTD) is proposed as a part of the ATLAS Phase-II upgrade to mitigate the impact of pileup on object reconstruction by precisely measuring the time of tracks. In addition, HGTD also provides an instantaneous measurement of the luminosity. HGTD is composed of 8032 front-end modules. Each module consists of two Low Gain Avalanche Detectors (LGADs) of...
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环宇 毕 (北京大学)
This presentation provides a phenomenological analysis of the production of $t\bar{t}W$ and $t\bar{t}Wj$ in the context of the Standard Model at the LHC with a center-of-mass energy of √s = 13 TeV. The analysis is focused on investigating various aspects of the computation, such as the impact of employing different theoretical modeling approaches, cross section ratio...
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Xiaowei JIANG (IHEP)
The report will introduce the construction status of the first LHCb (WLCG) tier1 site in China. The content will refer the progress of requesting the tier1 site, the site scalability, the current status and future work. The site is built under the cooperation of Chinese LHCb Collobaration and IHEP computing center.
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