超越标准模型前沿交叉研讨会

21 Nov 2025, 14:00 → 23 Nov 2025, 21:15 Asia/Shanghai

Frank Deppisch (University College London), Wei Liu (Nanjing University of Science and Technology), Yibin Qian, Yongchao Zhang (Southeast University)

由南京理工大学物理学院主办的“超越标准模型前沿交叉”研讨会，将于2025年11月21日至23日在南京举行。本次会议将围绕但不限于以下方向展开深入探讨：对撞机物理、早期宇宙、中微子与原子核物理交叉、以及暗物质理论与实验探测等前沿课题，重点关注最新实验发现与理论创新的交叉融合，深入探讨新物理的发展趋势。

 

会议时间：2025年11月21日（周五）报到注册，22-23日（周六、日）学术报告

地点：南京紫金山庄（南京市玄武区环陵路18号）

注册费：1000元/人。

食宿：会务组统一安排住宿，会议期间交通费和食宿费自理。

会议群：参会老师可以在会议附件里扫码加入会议微信群。

 

会议组委会：（按姓氏拼音顺序）

Frank F. Deppisch （英国伦敦大学学院）

刘威 （南京理工大学，联系电话：18606657421）

钱以斌 （南京理工大学）

张永超 （东南大学）

 

 

 

We are pleased to announce that the "Workshop on Physics Beyond SM" hosted by the School of Physics at Nanjing University of Science and Technology, will be held in Nanjing from November 21 to 23, 2025. The workshop will facilitate in-depth discussions on, but not limited to, the following frontier topics: collider physics, early universe, neutrino and nuclear physics, as well as theoretical and experimental aspects of dark matter. The event will focus on the integration of the latest experimental discoveries and theoretical innovations, with the aim of exploring future trends in new physics.

 

Dates:

Registration: Friday, November 21, 2025

Academic Sessions: Saturday, November 22, to Sunday, November 23, 2025

Venue: Nanjing Purple Mountain Hotel

Registration Fee: RMB 1,000 per person

Accommodation: The organizing committee will arrange accommodations, with participants bearing their own expenses.

Friday, 21 November

14:00 → 18:00 registration注 册

18:00 → 20:00 Dinner

Saturday, 22 November

08:20 → 08:35 Opening Remarks 开幕式

Convener: Wei Liu (Nanjing University of Science and Technology)

08:20 物理学院党委书记发言

Speaker: 鸿涛 李

背景ppt.pptx

08:35 → 09:50 Session 1

Convener: Yongchao Zhang (Southeast University)

08:35 Probing New Physics with Double Beta Decay

Speaker: Frank Deppisch (University College London)

deppisch-nanjing.pdf

09:00 Probe Neutrino & Dark Matter with Cosmic Gravitational Focusing

TBD

Speaker: Prof. Shao-Feng Ge (TDLI-SJTU)

251122_南京.pdf

09:25 Probing Axions and Millicharged Particles in Supernovae

TBD

Speaker: Zuowei Liu

251122-SN-MCP-LFVALP-Zuowei-Liu.pdf

09:50 → 10:20 Photo and Coffee Break

10:20 → 11:10 Session 2

Convener: Lei Wu (Nanjing Normal Univeristy)

10:20 Asymptotic GUT in extra dimension

Asymptotic unification, distinct from the conventional concept of unification, suggests that couplings unify at a fixed point in the deep ultraviolet (UV) limit. Theory with an interacting UV fixed point is normally referred to as asymptotic safety to address the famous UV Landau pole problem. Alternative to a usual grand unified theory (GUT), an asymptotic GUT gradually unifies gauge couplings in the deep UV limit. Using an economical and realistic particle content setup, we demonstrate that asymptotic grand unification can be achieved in SO(10) with one extra dimension. One intermediate scale, the Pati-Salam symmetry breaking scale, is included below the compactification scale. The top, bottom and tau masses are split, and the smallness of the neutrino mass is explained via inverse seesaw. Due to the absence of large-dimensional Higgs representations, gauge couplings exhibit asymptotic safety and are thus asymptotically unified, regardless of their initial values. In contrast, Yukawa couplings can achieve asymptotic freedom if the negative gauge contributions dominate over the positive Yukawa terms.

Speaker: Ye-Ling Zhou (HIAS-UCAS)

YLZ_Nanjing2511.pdf

10:45 Neutrinoless double beta decay within LRSM

TBD

Speaker: Prof. 栋梁 房 (中国科学院近代物理研究所)

LR0nbb.pdf

11:10 → 12:00 Session 3

Convener: Pei-Hong Gu (Southeast University)

11:10 Cosmological phase transitions with low nucleation rates: recent progress and implications

We study cosmological phase transitions in the low-nucleation-rate regime, where standard bubble percolation fails. Two distinct mechanisms emerge: (i) a bubble-free transition, in which a higher-energy vacuum within domain walls classically decays into the true vacuum, and (ii) super-Hubble separated bubbles, leading to ultra-supercooled or reheated transitions. These scenarios reveal unconventional dynamical pathways with significant implications for early-Universe evolution and gravitational-wave phenomenology.

Speaker: Yun Jiang

20251122_EWPTframework.pdf

11:35 Cosmological signatures of neutrino seesaw mechanism

The tiny neutrino masses are most naturally explained by seesaw mechanism through singlet right-handed neutrinos, which can further explain the matter-antimatter asymmetry in the Universe. In this work, we propose a new approach to study cosmological signatures of neutrino seesaw through the interaction between inflaton and right-handed neutrinos, which respects the shift symmetry. In our framework, after inflation the inflaton predominantly decays into right-handed neutrinos and its decay rate is modulated by the fluctuations of the Higgs field, which act as the source of curvature perturbations. This gives a new realization of Higgs modulated reheating, and it produces primordial non-Gaussian signatures that can be measured by the forthcoming large-scale structure surveys. We demonstrate, for the first time, that the measurements of non-Gaussianity by these surveys can probe the neutrino seesaw scale and have the potential to constrain a large portion of the seesaw parameter space, opening up a new window for directly testing the high-scale seesaw mechanism.

Speaker: Chengcheng Han (Sun Yat-sen university)

ChengchengHan.pptx

12:00 → 14:00 Lunch

14:00 → 14:50 Session 4

Convener: Ke Han (SJTU)

14:00 The Future of Muon Sources in China: Opportunities for New Physics Searches

This talk will present the status and plans of Chinese muon facilities, and possible new physics search programs proposed.

Speaker: Dr Ziwen Pan (USTC)

BSM Workshop-20251122-ZWP-v1.pdf

14:25 Search for neutrinoless double beta decay based on cryogenic bolometer

TBD

Speaker: 芳 谢 (复旦大学)

SearchforNeutrinolessDoubleBetaDecaywithCryogenicBolometer南京V2.pdf

14:50 → 15:40 Session 5

Convener: Yu Zhang

14:50 Probing lepton flavor mixing at colliders and in low-energy experiments

I will talk about several proposals, which aim to uncover lepton flavor mixing in the right-handed sector through processes at various colliders and in low-energy experiments.

Speaker: Gang Li (Sun Yat-Sen University)

15:15 Sterile Neutrino Oscillations with a Crossing-width Term

We developed an algorithm to compute the oscillation and decay of a sterile neutrino generated at a collider in the case that a crossing-width term exist. We also looked into the hidden structure of the S-matrix to extract the oscillating informations.

Speaker: Yi-Lei Tang (中山大学)

SterileNeutrinoOscillation.pdf

15:40 → 16:10 Coffee Break

16:10 → 17:00 Session 6

Convener: Xiaoyong Chu (ICTP-AP, UCAS)

16:10 Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders

TBD

Speaker: Yandong Liu (Beijing Normal University)

超越标准模型交叉会--刘言东.pdf

16:35 Searches for dark sector particles at Belle and Belle II

TBD

Speaker: Dr Sen Jia (Southeast University)

DarkSector@Belle2.pdf

17:00 → 17:50 Session 7

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

17:00 Dark Shower Searches using ML

TBD

Speaker: Bingxuan Liu (Shenzhen Campus of Sun Yat-sen University)

EXOTIC_BSM_DarkShower_ML_LHC_BingxuanLiu.pdf

17:25 Constraining long-lived particles from Higgs boson decays at the LHC with displaced vertices and jets

Long-lived particles (LLPs) originating from decays of Standard-Model-like or beyond-the-Standard-Model Higgs bosons are often featured with signatures of displaced vertices (DVs) and jets at colliders. In this work, we show that a recent ATLAS search for DVs plus jets, with its recast implementation, can efficiently place bounds on such hadronically or semileptonically decaying LLPs. In particular, we find the search is uniquely sensitive to LLP proper decay lengths of about $1\text{-}100$ mm, probing complementary regions in the parameter space of the relevant models compared to other prompt and LLP searches.

Speaker: Zeren Simon (泽人) Wang (王) (Hefei University of Technology)

dv_jets_scalar.pdf

17:50 → 20:00 Banquet

Sunday, 23 November

08:10 → 09:00 Session 8

Convener: Qing-Hong Cao (Peking University)

08:10 Elegant Scotogenic Neutrino Mass and Asymmetry

Speaker: Zhaofeng Kang

08:35 Leptogenesis via a new LNV effect

In this talk I will present a new mechanism that can gives rise to the successful baryogensis via Leptogenesis.

Speaker: Wei Chao (BNU)

2025-11-22-nj.pdf

09:00 → 09:50 Session 9

Convener: Yongcheng Wu (Nanjing Normal University)

09:00 Measuring Phase Transition Gravitational Waves and Higgs Self-couplings

I will discuss how to measure the gravitational wave spectrum from cosmological first order phase transitions, in particular the Electroweak phase transitions, and how to then predict observables which are important but difficult to measure by other experiments, like the Higgs self-couplings.

Speaker: Huaike Guo (University of Chinese Academy of Sciences)

Huaike_Guo.pdf

09:25 Relaxing BBN constraints on Heavy Neutral Leptons with Axion-like Particles

Heavy neutral leptons (HNLs) are constrained by requirements of Big Bang Nucleosynthesis (BBN) as their decays significantly impact the formation of the primordial elements. We propose here a model where the primary decay channel for the HNLs is to an axion-like particle (ALP) and a neutrino. Consequently, HNLs can decay earlier and evade the BBN bound for lower masses, provided the ALPs themselves decay considerably later. Further cosmological and astrophysical constraints limit severely the range of validity of the ALP properties. We find that a new parameter region opens up for HNLs with masses between 1 MeV and 1 GeV, and active-sterile neutrino mixing strengths between $10^{-9}$ and $10^{-6}$ that is consistent with constraints and can be probed in future searches. In such a scenario, current bounds as well as sensitivities of future direct HNL searches such as at NA62 and DUNE will be affected.

Speaker: Chayan Majumdar (IMP, CAS)

Chayan_NJUST.pdf

09:50 → 10:20 Coffee Break

10:20 → 11:10 Session 10

Convener: Hua-Xing Chen (Southeast University)

10:20 Search for the heavy photophobic axion-like particles at the LHC

TBD

Speaker: 科臣（Kechen） 王（Wang） (武汉理工大学（Wuhan University of Technology）)

heavy photophobic ALPs @ pp colliders-v6-up.pdf

10:45 Leptophilic axionlike particles at forward detectors

Leptophilic axion-like particles (ALPs) exhibit rich phenomenology, focusing exclusively on interactions between an ALP and Standard Model (SM) leptons. Through integration by parts, it is shown that both the three-point interaction, $a\bar\ell\ell$, and the four-point interaction, $a\ell^-\nu W^+$, play significant roles, making the flavor portal particularly compelling. For ALPs with masses ranging from $\mathcal O(1)$ MeV to $\mathcal O(1)$ GeV, they can contribute to exotic hadron decays. Suppressed couplings naturally extend the ALP lifetime, presenting opportunities for detection at forward detectors. In this study, we explore ALPs with both electrophilic and muonphilic scenarios. We propose an inclusive search for various hadrons that undergo exotic decays at the Large Hadron Collider (LHC). In the electrophilic scenario, long-lived ALPs are searched in the Forward Search Experiment (FASER) and its upgrading phase, FASER II. In the muonphilic scenario, where the ALP lifetime is significantly reduced due to its coupling to muons, we further investigate its detection potential at LHCb and its high-luminosity upgrade. Several benchmarks are analyzed, including electroweak-preserving, electroweak-violating and left-right softly asymmetric models, to demonstrate possible experimental constraints.

Speaker: Dr Chih-Ting Lu (Nanjing Normal University)

卢致廷_BSM前沿交叉.pdf

11:10 → 12:00 Session 11

Convener: Haiqing Zhou (Southeast University)

11:10 Loop-level lepton flavor violation in the left-right symmetric model

We consider the lepton flavor violation (LFV) processes generated at loop-level in the left-right symmetric model (LRSM). We pay special attention to the parameter space in which a light exotic CP-even scalar is produced in beam dump experiments or astrophysical processes. When the light scalar behaves as a long-lived particle, various current searches and prospects for future facilities can apply constraints to the relevant parameter space. We show our preliminary results and discuss their physical implications.

Speaker: Peiwen Wu (Southeast University)

LRSM_LFV_loop_BSM2025.pdf

11:35 CP Violation Beyond SM: Dark Photon and Goldstone boson Frameworks

This talk explores CP violation (CPV) in theories beyond the Standard Model (BSM). It addresses the long-standing puzzle that known CPV sources within the SM are insufficient to explain the observed matter-antimatter asymmetry of the universe, necessitating the identification of new CPV mechanisms. We present a systematic study of CPV mediated by two distinct BSM carriers: the dark photon and the Goldstone boson. The analysis demonstrates how their unique coupling structures generate observable CPV signals. By comparing their implications for electric dipole moments (EDMs), flavor-changing neutral currents (FCNCs), dark matter (DM), electroweak fits, and the resulting baryon asymmetry, we delineate the viable parameter space in light of current experimental constraints. Our findings underscore BSM CPV as an indispensable gateway to new physics at both the energy and precision frontiers.

Speaker: Jin Sun (韩国基础研究院)

Jin Sun-CPV-nanjing.pdf

12:00 → 12:10 Closing Remarks

Convener: Wei Liu (Nanjing University of Science and Technology)

12:10 → 14:00 Lunch

14:00 → 18:00 Free Discussion

18:00 → 20:00 Dinner