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TDLI-PKU BSM workshop 2022: Electroweak lights the way

1–3 Aug 2022
Tsung-Dao Lee Institute
Asia/Shanghai timezone

Contribution List

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51. Opening
Jason Evans (SJTU/TDLI)
01/08/2022, 08:55
19. Some lessons from recent experimental anomalies
JiJi Fan
01/08/2022, 09:00

Recently there have been two interesting and intriguing experimental results, one on the muon g-2 from Fermilab and one on the W boson mass from CDF. I will discuss some possible implications of these results for new physics, provided that they survive. For muon g-2, I will discuss a relatively new explanation using the loop effects of a heavy axion coupling to leptons and photons. I will...
20. Recent progress in Muon g-2
Kim Siang Khaw
01/08/2022, 09:40

Muon magnetic anomaly is a very sensitive probe to new physics beyond the Standard Model. It can be calculated with very high precision in the Standard Model and can be precisely measured using the magnetic storage ring approach. The first result from the Fermilab Muon g-2 experiment has triggered a worldwide effort in scrutinizing both the Standard Model predictions and experimental...
21. Supersymmetry is the Physics of this Century
Tsutomu Yanagida
01/08/2022, 10:40
22. SMEFT at future lepton colliders
Jiayin Gu
01/08/2022, 11:20
31. B anomaly hunting at the LHC: tau b + missing search for leptoquarks
Teppei Kitahara
01/08/2022, 14:00

One of the long-standing B anomalies is the $b \to c \tau \nu$ anomaly, which remains at $\sim 4$ sigma level. This anomaly will be confirmed or disappeared by the ongoing Belle II and LHCb experiments. In this talk, we will discuss the possibility that another crosscheck could be possible by the LHC search. In our work arXiv:2111.04748, we study non-resonant searched for new physics at the...
7. Dark SHINE——Dark Photon fixed-target search experiment at SHINE Facility
Jing Chen (SJTU/TDLI)
01/08/2022, 14:40

This talk will present the R&D study of the prospect and feasibility to deploy the fixed-target experiment utilizing the high rate single electron beam from the SHINE facility under construction. The project is officially sponsored by NSFC Original Exploration Project 2021 and Shanghai pilot program for basic research.
18. Electroweak precision tests for triplet scalar
Huang Fei (SJTU)
01/08/2022, 15:00

Electroweak precision observables are fundamental for testing the standard model (SM) or its extensions. The influences on observables from new physics within the electroweak sector will be expressed in terms of oblique parameters S, T, U. By performing the global fit with the CDF new W mass, we obtain $S=0.03 \pm 0.03$, $T=0.06 \pm 0.02$ and $U=0.16 \pm 0.03$ or $S=0.14 \pm 0.03$, $T=0.24...
6. Search for HH-->4b production and H-->aa-->4b exotic decays with ATLAS and CEPC
Zhen Wang (TDLI/SJTU)
01/08/2022, 15:20

This talk will present the HH-->4b analysis result at ATLAS and also the exotic decays of 125GeV SM Higgs to light singlet scalar pairs in 4b final states with future circular colliders such as CEPC.
5. Search for Dark Higgs at ATLAS and potential to utilize the Xbb tagger
Changqiao LI (SJTU/TDLI)
01/08/2022, 16:00

This talk will present the latest searches for Mono-H125 and Mono-Scalar productions with SM and BSM Higgs at ATLAS, as a direct probe to BSM portal of new physics and especially Dark Matter. A potential of utilizing the boosted Xbb tagger will be also discussed.
3. Muon Electric Dipole Moment as a Probe of Flavor-Diagonal CP Violation
Yoshihiro Shigekami (Tsung-Dao Lee Institute)
01/08/2022, 16:20

Electric dipole moments (EDMs) of elementary particles are powerful probes of new physics with flavor-diagonal CP violation. The reported discrepancy in the muon anomalous magnetic moment motivates us to explore to what extent new physics with flavor-diagonal CP violation to address the discrepancy is probed by searches for the muon EDM. As a benchmark, we focus on a CP-violating...
25. Muon g-2 and B anomalies from Dark Matter
Lorenzo Calibbi
02/08/2022, 09:00

We systematically build and discuss a class of models with minimal field content that can simultaneously provide: (i) a thermal Dark Matter (DM) candidate; (ii) large loop contributions to $b\to s\ell\ell$ processes able to address $R_K$ and the other $B$ anomalies; (iii) a natural solution to the muon $g-2$ discrepancy through chirally-enhanced contributions. We show what are the minimal...
24. Recent updates on Higgs properties measurement at CMS and ATLAS
Kun Liu (TDLI / SJTU)
02/08/2022, 09:40

After 10 years of the Higgs boson discovery, the leading Higgs production and decay channels have been observed at the Large Hadron Collider, i.e: ggF, VBF, WH, ZH, ttH and H→bb, WW, 𝛕𝛕, ZZ, 𝛄𝛄 etc. The measurement of Higgs couplings with vector bosons and with third generation of fermions has reached to 10%-15% level of precision. Moreover, Higgs self-coupling as well as Higgs couplings with...
23. Probing electroweak phase transition with multi-TeV muon colliders and gravitational waves
Kepan Xie
02/08/2022, 10:40

We study the complementarity of the proposed multi-TeV muon colliders and the near-future gravitational wave (GW) detectors to the first order electroweak phase transition (FOEWPT), taking the real scalar extended Standard Model as the representative model. A detailed collider simulation shows the FOEWPT parameter space can be greatly probed via the vector boson fusion production of the...
26. Higgs rare and exotic decays at CMS and ATLAS
Chen Zhou
02/08/2022, 11:20

This talk will discuss the recent results about the rare and exotic decays of the Higgs boson from the CMS and ATLAS experiments. These decay modes are important portals to refine our understanding of the electroweak sector and search for new physics.
2. Flavor-changing Majoron interactions with leptons
Jin Sun (Shanghai Jiao Tong University)
02/08/2022, 14:20

When the Standard Model Higgs sector is extended with a complex singlet that breaks global lepton number symmetry spontaneously, a massless Goldstone boson called the Majoron $J$ arises. In addition to increasing Higgs invisible decay through mixing, the Majoron can generally have flavor-changing interactions with fermions. We use the type-III seesaw mechanism to demonstrate the existence of...
9. Vector Boson Scattering and new phenomena at LHC
Despoina Sampsonidou (Tsung-Dao Lee Institute, Shanghai Jiao Tong Univ.)
02/08/2022, 14:40

Observations of Vector Boson Scattering processes (VBS) are one of the major achievements of EWSB and Higgs unitarization mechanism studies at LHC Run2. This talk will bring the latest news from LHC in VBS observations and highly evident measurements, as well as the bridge to new physics portal utilizing such scattering final states.
10. Charged Lepton Flavor Violation at the EIC
Bin Yan (IHEP)
02/08/2022, 15:00

We present a comprehensive analysis of the potential sensitivity of the Electron-Ion Collider (EIC) to charged lepton flavor violation (CLFV)
in the channel $ep\to \tau X$, within the model-independent framework of the Standard Model Effective Field Theory (SMEFT).
We compute the relevant cross sections to leading order in QCD and electroweak corrections and perform simulations of signal...
11. Search for top quark FCNC interactions at ATLAS
Mingming Xia (Tsinghua University)
02/08/2022, 15:40

The large dataset collected by the ATLAS detector at allows to probe the presence of new physics that could enhance the rate of rare processes in the SM. The LHC can therefore gain considerable sensitivity for Flavour Changing Neutral Current (FCNC) interactions of the top quark. The ATLAS experiment has performed searches for FCNC couplings of the top quark with a photon, gluon, Z boson or...
12. CP-violating dark photon kinetic mixing and type-III seesaw model
Yu Cheng
02/08/2022, 16:00

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 hypercharge gauge boson and a new U(1)X gauge boson. In the effective field theory context, one
may write nonrenormalizable CP-violating kinetic mixing interactions involving the...
13. Type-II Seesaw Triplet Scalar Effects on Neutrino Trident Scattering
Mingwei Li (TDLI)
02/08/2022, 16:20

In Type-II seesaw model, an electroweak triplet scalar field $\Delta$ with a non-zero vacuum expectation value (vev) $v_\Delta$ is introduced to facilitate the generation of small neutrino masses. A non-zero $v_\Delta$ also affects the W mass through the electroweak $\rho$ parameter, making it to be less than 1 as predicted by standard model (SM). The component fields in $\Delta$ come along...
27. MeV new physics light from muon g-2
Xiaoping Wang
03/08/2022, 09:00

The muon g-2 is an interesting observable, since it can be measured with great precision and can be computed with excellent accuracy within the Standard Model (SM). The current experimental measurement of muon g-2 shows a deviation to the SM prediction, which may be a hint of new physics. A light particle, scalar or vector, can be nature new physics candidates to explain the current muon g-2...
28. First Results from XENONnT
Fei Gao
03/08/2022, 09:40
29. CP/flavor-safe SUSY model for light sleptons
Norimi Yokozaki
03/08/2022, 10:40

SUSY CP and flavor problems are central issues for SUSY scenarios with light sleptons whose masses are below or around the TeV scale. In particular, these problems are severe when SUSY is responsible for the muon g-2 anomaly: the CP problem is more difficult than naively thought, given the effects of anomaly mediation, etc. In this talk, I will introduce a CP/flavor-safe SUSY breaking...
30. Neutron-mirror-neutron oscillation and neutron star cooling
Yongchao Zhang
03/08/2022, 11:20

In the dense environment of neutron stars (NSs), neutrons $n$ can transit into mirror neutrons $n’$, which exist in some mirror models. Such a transition leads to exotic energy loss of NSs via emission of photons, which sets limit on the $n-n’$ mixing parameter $\delta_{nn’} \lesssim 10^{-17}$ eV. We point out that the beta decay of mirror neutrons and the subsequent formation of clouds of...
15. Electroweak ALP Searches at a Muon Collider
Lingfeng Li (Brown U.)
03/08/2022, 14:40

A high-energy muon collider with center-of-mass energy around and above 10 TeV is also a vector boson fusion (VBF) machine, due to the significant virtual electroweak (EW) gauge boson content of high-energy muon beams. This feature, together with the clean environment, makes it an ideal collider to search for TeV-scale axion-like particles (ALP) coupling to Standard Model EW gauge bosons,...
16. Dark Hadrons at Lifetime Frontier Experiments
Takumi Kuwahara (Peking U)
03/08/2022, 15:00

Dark hadrons are hypothetical particles which reside in the dark sector and originate from the confining gauge dynamics in the dark sector. These particles are proposed in several dark sector models, such as composite asymmetric dark matter models and strongly interacting massive particle models. The dark sector is feebly connected to our sector through dark photons which kinematically mix...
14. A search for heavy Higgs bosons decaying into vector bosons in same-sign two-lepton final states in $pp$ collisions at $\sqrt{s}=13$~TeV with the ATLAS detector
Yue Xu
03/08/2022, 15:40

A search for heavy Higgs bosons decaying into a pair of vector bosons and produced in association with a vector boson is performed, using final states with two leptons of the same electric charge (electrons or muons), missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider...
8. Precise Measurements of Z+photon final states and search for anomalous neutral gauge couplings with EFT at ATLAS
Danning Liu (TDLI/SJTU)
03/08/2022, 16:00

This talk will present the latest result of precise measurement of Z+photon+jets differential cross sections and the probe of BSM new physics via anomalous neutral gauge couplings parameterized with EFT formalism at ATLAS.
17. Dark photon kinetic mixing effects for the CDF W-mass measurement
Zhi-peng Xing (TDLI)
03/08/2022, 16:20

A new $U(1)_X$ gauge boson $X$ primarily interacting with a dark sector can have renormalizable kinetic mixing with the standard model (SM) $U(1)_Y$ gauge boson $Y$. This mixing besides introduces interactions of dark photon and dark sector with SM particles, it also modifies interactions among SM particles. The modified interactions can be casted into the oblique $S$, $T$ and $U$...
32. Invited talk
33. Invited talk
Zhaofeng Kang
34. SMEFT Pathway to New Physics
Jianghao Yu
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