Conveners
分会1：TeV物理和超出标准模型新物理
- Chair1：曹庆宏 (Peking University)
- Chair2：卢建新 (中国科学技术大学)
分会1：TeV物理和超出标准模型新物理
- Chair2：王青 (TsingHua University)
- Chair1：杨海军 (Shanghai Jiao Tong University)
分会1：TeV物理和超出标准模型新物理
- Chair2：张华桥 (IHEP)
- Chair1：阮曼奇 (IHEP)
分会1：TeV物理和超出标准模型新物理
- Chair2：冯波 (华南师范大学)
- Chair1：黄燕萍 (高能所)
I will presents a combination of searches for Higgs boson pair (HH) production performed by the ATLAS and CMS Collaborations using Run 2 data.
In this talk, I will present the latest results on the search for Higgs boson decaying into dimuon final state as well as the search for Higgs boson pair production using bb𝜏𝜏 final state at the ATLAS experiment. In addition, I will present the corresponding HL-LHC projection results based on the latest analysis strategy.
A search for di-Higgs boson production in the HH→bbγγ channel is presented using proton-proton collision data collected by the CMS experiment. Combining the large H→bb branching fraction with the excellent diphoton mass resolution of CMS, this channel provides strong sensitivity to the Higgs self-coupling and potential beyond-Standard-Model signatures. The analysis strategy and its sensitivity...
The 2HDM+S is the singlet extension of the two-Higgs-doublet model (2HDM). The singlet field and its mixing with the 2HDM Higgs sector lead to new contributions to the electroweak precision observables, in particular, the oblique parameters, as well as the direct searches of BSM Higgs In this work we performed a systematic investigation of the impacts of each mixing angle on the oblique...
Sphaleron dynamics in the Standard Model at high-energy particle collisions remains experimentally unobserved, with theoretical predictions hindered by its nonperturbative real-time nature. In this work, we investigate a quantum simulation approach to this challenge. Taking the 1+1D $O(3)$ nonlinear $\sigma$-model as a protocol towards studying dynamics of the sphaleron in electroweak theory,...
本报告将以LHC上的 toponium 和 BES上的 psi(2S)->tau tau为例，介绍 t tbar 之间，以及 tau+ tau- 之间的自旋纠缠相关理论预言和实验测量方案。
A study of angular correlations inside jets induced by gluon polarization is performed using proton-proton collisions at a center-of-mass energy of \sqrt{s} = 13.6 TeV. The data correspond to an integrated luminosity of 34.7 fb^{-1}, collected in 2022 with the CMS detector at the LHC. The details of the parton shower are investigated using jets reconstructed with the anti-k_\mathrm{T}...
Compared with SMEFT, HEFT is applicable to a broader class of spontaneous symmetry breaking scenarios. However, its non-linear structure and the fact that HEFT is formulated directly in the broken phase make UV-HEFT matching more challenging. In the first part of this talk, we present a non-linear framework for ultraviolet theories that is particularly suitable for implementing UV-HEFT...
Soft unclustered energy patterns (SUEPs) are characterized by high-multiplicity, isotropic distributions of low-momentum particles. The search for SUEPs containing muons in the final state is presented using 140 fb^−1 of proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider during 2015–2018. The analysis targets SUEP signatures produced via gluon–gluon...
This report summarizes the current experimental landscape, covering both conventional WIMP searches and the explorations of the broader Dark Sector. This will also discuss the critical role of theory benchmark model preparation — such as the 2HDM+a framework in guiding Run 3 analyses and interpreting results. This report highlights the evolving strategies to probe the dark matter on colliders.
Among the charged leptons, the $\tau$ electric dipole moment ($d_\tau$) is the least constrained. We show that the Im[$d_\tau$] imposes strong constraints on new physics that have yet to be discussed. Motivated in particular by the Super Tau-Charm Facility (STCF), which will provide a uniquely clean environment for precision $\tau$-physics, we study the momentum-transfer dependence of...
This talk reviews recent results of exotic physics searches at the CMS experiment. The selected results either applied novel analysis techniques that significantly extended previous search limits, or observed hints of excess.
Exotic physics searches include, but are not limited to, heavy fermions, heavy gauge bosons, extra dimensions, and model-independent general searches.
COMET实验位于日本东海的J-PARC质子加速器研究中心，旨在以超高灵敏度搜寻带电轻子味破坏过程（CLFV过程），即无中微子伴随的μ-e转换（μ⁻ + N → e⁻ + N）。在标准模型中，轻子味严格守恒，此类CLFV过程被严格禁止；但在一些超出标准模型的新物理模型中（如超对称理论等），预言了其分支比将显著增强。因此，COMET实验是寻找超出标准模型的新物理最有力工具之一。COMET实验采用高强度脉冲质子束轰击静止靶产生大量π介子，π衰变产生的μ子经超导螺线管磁铁捕获并输运至铝制停止靶，形成μ子原子。COMET实验利用脉冲式束流、主动宇宙学屏蔽以及精心设计的偏转磁铁系统，可有效抑制本底事件。COMET实验采用分阶段实施的方法，分为了Phase-I和phase-II。Phase-I 预计物理灵敏度可达约...
The ATLAS collaboration has released its next-generation flavour tagging algorithm, based on a transformer architecture [1]. The performance is enhanced significantly and the performance in data matches that in the simulation. Recent physics analyses have reported large improvements in sensitivity thanks to the new tagger [2]. In this talk, I will discuss how the tagger was developed and the...
We invent a new method of bootstrapping multi-loop QCD amplitudes. Using the analytic function space of two-loop six-point Feynman integrals, an ansatz was set for the two-loop six-gluon QCD amplitudes. From the collinear and triple collinear limits, the weight-four and leading colour part of two-loop six-gluon amplitude is uniquely fixed.
In this talk, we report the first complete results of the four-loop non-singlet splitting functions in QCD. Splitting functions govern the scale evolution of parton distribution functions, which enter the theoretical predictions for all physical processes at high-energy hadron colliders. According to their flavor group structure, splitting functions are classified into non-singlet and singlet...
We point out that a multi-TeV muon collider can simultaneously be a high energy neutrino collider as a result of radiations of soft electroweak gauge boson $W^\pm$. We consider the processes $\mu^+\mu^- \to \ell^+\ell^-$, $\nu\mu^\pm \to \nu \ell^\pm$ and $\nu\bar \nu \to \ell \bar\ell$ near the collider energies to probe the physics beyond the Standard Model. We adopt simplified models with...
We calculate all three-loop, five-point, massless planar Feynman integral families in the dimensional regularization scheme. This is a new milestone in Feynman integral computations. The analysis covers four distinct families of Feynman integrals for this configuration, for all of which we derive the canonical differential equations. Our results also confirm a prediction on the three-loop...
The muon anomalous magnetic moment, aμ = (g−2)/2, and the muon electric dipole moment are precision observables with exceptional sensitivity to physics beyond the Standard Model. The successive Muon g−2 experiments at CERN, Brookhaven, and Fermilab were recognized with the 2026 Breakthrough Prize in Fundamental Physics, highlighting the long-standing impact of this program on precision tests...
We present the design and the sensitivity reach of the Qubit-based Light Dark Matter detection experiment. We propose the novel two-chip design to reduce signal dissipation, with quantum parity measurement to enhance single-phonon detection sensitivity. We demonstrate the performance of the detector with full phonon and quasiparticle simulations. The experiment is projected to detect $> 30$...
本次报告中我会介绍下电弱相变引力波基于空间引力波探测器太极等的探测预期研究，及相应的唯象学研究方面的影响，如基于太极对希格斯耦合探测的预期等。
The BESIII experiment is a symmetric e+e- collider operating at c.m. energy from 2.0 to 4.95 GeV. With the world’s largest threshold production data set of J/ψ (10 billion), ψ(3686) (2.6 billion), and 20 fb^-1 D meson pairs from ψ((3770) decay, we are able to search for various dark sectors produced in e+e- annihilation and meson decay processes. In this talk, we report the search for...
The talk with present the cross section measurements of the Higgs bosons decaying to a pair of hadronically decaying tau leptons in the high Lorentz-boosted regime. The analysis is based on the full Run 2 dataset of proton-proton collisions at a center-of-mass energy of √s=13 TeV and a partial Run 3 dataset at √s=13.6 TeV collected in the 2022-2024 period by the ATLAS experiment. The analysis...
A search for pairs of light neutral pseudoscalar bosons ($A$) resulting from the decay of a Higgs boson is performed. The search is conducted using LHC proton-proton collision data at $\sqrt{s}=13~\mathrm{TeV}$, collected with the CMS detector in 2016--2018 and corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. The $A$ boson decays into a highly collimated electron-positron...
A search for the Higgs boson decay to a $Z$ boson and a photon in the $\ell\ell\gamma$ ($\ell = e, \mu$) final state is performed using $pp$ collisions at $\sqrt{s}=13.6~\mathrm{TeV}$ recorded with the ATLAS detector at the Large Hadron Collider during 2022--2024, corresponding to an integrated luminosity of $165~\mathrm{fb}^{-1}$. The signal yield, normalised to the Standard Model prediction,...
The talk will present the recent results of Higgs boson property measurements and new resonance searches in the diphoton channel at CMS. The talk will cover the published results of the relevant analyses IHEP dominated and contributed in past 2 years, including the Higgs boson mass and cross section, low-mass and very low-mass diphoton resonances, and the resonant HH/HY with H decaying into...
We present a theoretical study of the azimuthal decorrelation $\delta\phi$ and transverse momentum imbalance $q_T$ in dijet production at the LHC, offering intriguing insights into the dynamics of quantum chromodynamics. We define the jet axes using the recoil-free winner-take-all (WTA) recombination scheme. For the azimuthal decorrelation $\delta\phi$, this axis choice eliminates non-global...
The $\mu$-$e$ conversion process is one of the most powerful ways to test lepton-flavor-violating (LFV) interactions involving charged leptons. The standard model with massive neutrinos predicts an extremely low rate for $\mu$-$e$ conversion, making this process an excellent probe for testing LFV arising from new physics. Among many theoretical models that can induce LFV, the Supersymmetric...
This talk will present a measurement of the cross section of W boson pair production in photon fusion (γγ → WW), using an integrated luminosity of 138 fb^−1 of proton-proton collision data collected by the CMS experiment in 2016-2018 at a center-of-mass energy of √s = 13 TeV. Events are selected in the final state with one electron, one muon, and a low multiplicity of tracks associated with...
This talk will give a quick overview of recent ATLAS SM Multi-Boson measurement and Multi-Higgs measurement results including the highlight of recent inclusive diboson, VBS polarization, triboson observation, Tri-Higgs search and Di-Higgs combination results by ATLAS, with emphasis of the deep connection of EWSB and Higgs physics.
Multi-boson processes are among the most sensitive tests of the Standard Model. Theoretical predictions for these interactions are extremely precise, so even small discrepancies could point to new physics phenomena. Triboson processes are the rarest of this kind, offering unique sensitivity to probe quartic boson couplings and complementarity with Higgs physics and searches beyond the Standard...
近年由Arkani-Hamed、何颂等发现的隐藏零点、以及与零点相伴随的称为2-分裂的新因子化结构，揭示了散射振幅的全新解析性质与物理性质。在这个报告中，我将介绍如何从费曼图、BCFW在壳递推关系、振幅的普适展开这三个不同角度来理解隐藏零点与2-分裂，尝试挖掘其物理图像，并讨论从两个方面推广隐藏零点与2-分裂性质——1.推广到更多物理模型；2.推广到圈图层次的费曼积分被积函数。
The infrared structure of gauge theories with chiral fermions remains largely unexplored. In this work we investigate the Bars--Yankielowicz class using the functional renormalisation group, building on recent developments in gauge--fermion systems that provide clear criteria for confinement and dynamical symmetry breaking.
We show that two distinct phases arise: one exhibiting both...
量子纠缠是量子系统的基本特性。标准模型预言，Higgs粒子衰变产生双光子过程（$H\to\gamma\gamma$）处于最大纠缠态。以往对纠缠光子的检验多集中在光学或原子物理体系中。本文将通过转换光子，推导并模拟一种在高能对撞机上检验光子量子纠缠的方法。转换光子产生的电子对的运动学参量可以反映光子的极化信息。可以通过末态轻子运动学量的微分截面分布重建光子对极化密度矩阵，从而检验其是否处于纠缠态。
本文运用末态运动学量和总过程截面的相关公式，推导出可观测量$\phi$（即末态正电子相对于其母光子的方位角之和）的分布可反映双光子的纠缠程度。本文也考虑了主要本底——非共振双光子过程（$q\bar{q}\to\gamma\gamma$）的影响。预计在转换光子高效重建以及$H\to\gamma\gamma$信号丰富的条件下，如HL-LHC或Higgs工厂中，本文方法将获得更佳结果。
Four-top-quark production at the LHC is a rare Standard Model process and an important probe of top-quark interactions and possible new physics. The fully hadronic decay channel offers a large branching fraction, but its reconstruction is challenging due to the high jet multiplicity and severe combinatorial ambiguity. In this study, we investigate the reconstruction of fully hadronic...
The treatment of the electroweak modeling will be presented, including higher-order electroweak corrections and associated electroweak uncertainties. Assessment of the muon performance using J/$\psi$ events will also be discussed.
A search for a massless beyond-standard-model particle is performed in the decay Ξ^0->Λ+invisible using (1.0087±0.0044)10^10 J/ψ events collected with the BESIII detector at the BEPCII collider. No significant signal is observed, and the upper limit on the branching fraction is set to be B(Ξ^0->Λ+invisible)<2.310^-4 at the 90% confidence level. This is the first search for a flavor-changing...
