This talk will summarize recent progress of the CEPC accelerator studies, in particular the R&D efforts in the Phase of CEPC Engineering Design Report.

Silicon detector & Stitching VTX at the CEPC

The future e+e−Higgs factory, whose main goal is to achieve a precise measurement of mass and properties of the Higgs boson, is the main development trend of the next-generation large collider. A big challenge for this goal is to fulfill an unprecedented jet energy resolution, and the scheme selection of hadronic calorimeter (HCAL) is one of the most important factors. Scintillation materials...

I will give a short summary on the representative topics of neutrino physics at the future high energy lepton collider CEPC.

CEPC, as a future electroweak, Higgs, and top factory, has great but often overlooked potentials for flavor physics studies. The Tera-Z mode of CEPC will generate O(10^12) Z bosons decaying on-shell, giving rise to a considerable collection of tau leptons and heavy flavored hadrons. Higher energy modes of CEPC also contribute to flavor physics in unique ways.

Baryonic two-body $B$ mesons decays have been measured experimentally for some time, which provides an excellent ground for studying the QCD of baryonic $B$ decays. In this work, we investigate the two-body doubly-charmed baryonic $B$ decays in the perturbative QCD (PQCD) approach including higher twist contributions to the light-cone distribution amplitudes (LCDAs). The charmed baryon LCDAs...

We researched the two body non-leptonic B decays to radilly excited D mesons under the covariant light-front quark model.

Charmless two-body B-meson decays to baryon-antibaryon pairs serve as key probes for strong interaction dynamics and CP violation but remain underexplored. This is the first observation of the rare baryonic decay B->p Lambda_bar. The significantly improved branching fraction measurement and the first measurement of the weak decay parameter in this work are of great interests for testing ...

Electromagnetic dipole interactions of light quarks induce distinct spin correlations in quark pairs produced at lepton colliders, favoring entangled spin-triplet state aligned along the $\hat{z}$ axis or spin-singlet state. These correlations lead to unique $\cos(\phi_1-\phi_2)$ azimuthal asymmetries in inclusive $\pi^+\pi^-$-dihadron pair production and in back-to-back hadron pairs...

In this talk, we present a calibratable, jet-free framework that enhances the search significance of the flagship LHC channel $HH \to 4b$ by more than a factor of five compared to existing strategies. The approach employs a mass-decorrelated discriminant for identifying $h_1 h_2 \to 4b$ with variable $h_{1,2}$ masses, together with a simultaneous estimator of $(m_{h_1}, m_{h_2})$, both...

A comprehensive study of triple Higgs boson production in the $4\tau 2b$ decay final state is performed for the first time at a future 100 TeV hadron collider. The analysis incorporates modified Higgs self-couplings via trilinear Higgs self-coupling $c_3$ and quartic Higgs self-coupling $d_4$, enabling for a model-independent investigation of potential new physics effects. Higgs bosons are...

Based on several features observed in the data collected during Run 1 of the LHC, a
simplified model was proposed in which a heavy scalar, H, decays into a combination of the
SM Higgs boson (h) and a new Higgs-like scalar, S. One implication of this model is the
appearance of excesses in lepton production when the decay S →WW dominates. These
excesses, referred to as the multi-lepton...

Current experimental results indicate that if axion-like particles (ALPs) indeed exist, their interactions with photons are weak over a large mass range. Therefore, we assume that ALPs do not couple to diphotons and have conducted detailed analyses on the decay mode of such heavy photophobic ALPs into boson final states ($WW, \gamma Z$) at the High-Luminosity Large Hadron Collider (HL-LHC, $...

类矢量费米子（Vector-Like Fermions, VLFs）在多种超出标准模型的新物理理论中普遍出现。与标准模型费米子不同，它们的左右手分量在电弱群下具有相同的表示，因此可拥有独立的矢量质量项，从而在电弱精密测量中更易退耦。我们基于 LHC ATLAS 与 CMS 的最新数据（截至 2024 年底），对类矢量夸克（VLQs）的成对产生与单产生过程进行了系统综述，并给出了单态、二重态和三重态表示下的排除参数空间。结果显示：类矢量顶夸克在单态情形下的质量已被排除至 1.49 TeV；单产生过程在质量约 1.5 TeV 时将混合参数限制到 κ < 0.26。类矢量底夸克在双态情形下被排除至 1.52 TeV，其单产生过程对 κ 的约束区间为 0.2–0.7。对于奇异型 VLQ，成对产生分别将 X 与 Y 的质量排除至 1.46 TeV 与 1.7 TeV，单产生对 κ...

The discovery of the 125 GeV Standard Model (SM) Higgs boson confirmed electroweak symmetry breaking, yet unresolved issues, including the hierarchy problem, dark matter, and baryon asymmetry, point to new physics with extended scalar sectors. Experimental anomalies around 95 GeV in channels like $b\bar{b}$, $\tau^+\tau^-$, and $\gamma\gamma$ have further sparked interest in a potential...

Experiments at the CERN Large Hadron Collider (LHC) have accumulated an unprecedented amount of data corresponding to a large variety of quantum states. Although searching for new particles beyond the Standard Model of particle physics remains a high priority for the LHC program, precision measurements of the physical processes predicted in the Standard Model continue to lead us to a deeper...

Quantum entanglement, a profound feature of quantum mechanics where particles share interconnected states regardless of distance, has been extensively studied in low-energy systems like photons and atoms. Exploring entanglement in high-energy particle collisions offers unique opportunities to probe quantum phenomena under extreme conditions and test fundamental principles like nonlocality....

The dark photon portal, a leading framework for connecting the Standard Model (SM) with dark matter, is extended in this work to include several novel and consequential mechanisms. Beyond the standard kinetic mixing with the hypercharge field, we incorporate mass mixing via an additional Higgs doublet. Furthermore, we introduce a non-Abelian kinetic mixing between the $U(1)_X$ and $SU(2)_L$...

In the phenomenology study of dark photon, its mass origin is usually not under concern. However, in theory construction its mass is often generated via a dark Higgs mechanism, which leads to the presence of a light (non-decoupled) dark Higgs particle.We study the impact of such a dark Higgs particle in the collider detection of the dark photon. We focus on the process of final state dark...

Motivated by the multi-lepton anomalies at the LHC, a sideband analysis of γγ, Zγ, and WW spectra in Run 2 data reveals a narrow resonance
at mS = 152 ±1 GeV with a global significance of 5.3σ, while the ZZ channel remains SM-
like. This pattern is consistent with the Real Higgs Triplet (RHT) model with hypercharge
Y = 0, in which S does not couple to ZZ at tree level. In this framework,...

The Flipped Next-to-2HDM (N2HDM-F) provides an elegant solution to the possible 95 GeV signal excesses, and the proposed Future Circular Electron-Positron Collider (CEPC) offers a promising opportunity to probe this light Higgs boson ($S$). A Monte Carlo (MC) simulation of the $e^+e^-\to Z(\to\mu^+\mu^-)S(\to \tau^+\tau^-)$ process is performed to study the discovery potential for $S$ and the...

We propose a model-independent approach to test for CP (Charge-Parity)-violation in the scalar sector. We simply extend the Standard Model (SM) by introducing a heavy neutral scalar particle and the couplings of $h_2VV$ ($V = W^{\pm}, Z$) and $h_2h_1Z$ vertices, where $h_1, h_2$ stand for the 125 GeV SM Higgs boson and the heavy neutral scalar particle we add respectively. This is possible at...

This report will summarize the new updates or highlights of Chininese LHC computing recently.

IHEP-CC is a crucial partner in the global HEP computing landscape, providing robust and expanding computational and storage resources for current and future scientific discoveries.
We will intrduce the overview of the IHEP Computing Center(IHEPCC) and the grid sites running status and accounting in IHEPCC.

The LHCb Tier2 site has been successfully constructed in Lanzhou University and running smoothly, we will present the recent status of the computing cluster.

Shandong University holds the dedicated cluster for high energy physics, currently with approximately 1,500 CPU cores, 2 PB of storage, and 66 GPU cards, supporting various experiments including BESIII, Belle II, LHC, LHAASO, STCF, and STAR.

In the past year, the heavily utilized system supported over 160 users, executing more than 1 million jobs and consuming over 2 million CPU hours....

The USTC computing cluster has been updated this year, including software upgrades and worknode expansion.

Currently, CNIC is responsible for the operation and maintenance of two EGI cloud sites in Mainland China: CSTCLOUD-EGI and CENI. This report will detail the operational status and issues concerning these two sites.

This report summarizes ALICE computing activities in China. It introduces the participating institutes and the Chinese ALICE community, outlines the establishment and operation of the Tier-2 site at IHEP Beijing, and highlights its integration into the global computing infrastructure. The report also discusses operational experience and future plans for resource expansion and enhanced support...

ATLAS Computing

As LHC run3 keep taking more and more data (up to 244 fb-1 for CMS now), the demanding on the coumputing and storage, as well as the usage of GPU for machinelearning studies are keep increasing. in this presentation, I will give the status report of Chinese CMS computing resources, its usage, and feedbacks from users.

The LHCb experiment is operating in Run 3 at an unprecedented instantaneous luminosity of 2×10³³ cm⁻²s⁻¹. To process the resulting 30 MHz non-empty bunch-crossing rate, LHCb has deployed a novel, fully software-based trigger for the first time. Its second stage performs offline-quality event reconstruction in real-time, enabled by the continuous processing of alignment and calibration data....

With the increasing size of the machine learning (ML) model and vast datasets, the foundation model has transformed how we apply ML to solve real-world problems. Multimodal language models like chatGPT and Llama have expanded their capability to specialized tasks with common pre-train. Similarly, in high-energy physics (HEP), common tasks in the analysis face recurring challenges that demand...

IHEP Remote Operation Center report

The analysis aims to obtain the results of High gain and Medium gain intercalicration by using data23 and data24 special runs, which were acquired with the threshold to switch from High gain to Medium gain LAr readout in both the first and second layers of the EM calorimeter significantly lowered.

A discrepancy between the reconstructed dielectron invariant mass $_{^{+}^{−}}$ obtained...

The Upstream Tracker (UT) is a four-layer silicon microstrip detector installed during the LHCb upgrade I. The UT is crucial for reconstructing charged particle trajectories, especially for long-lived particles beyond the acceptance of the vertex detector. The operation of the UT, including calibration, monitoring and strategies of tackling single-event upset issue will be addressed in this...

Introduce Run3 CMS ECAL calibration performance

This talk presents the offline reconstruction and identification performance of electrons and photons at CMS using proton-proton collision data collected in 2022 and 2023 at a center of mass energy of 13.6 TeV. The corrections and scale factors derived and applied to collision data and simulation are also discussed.

We discuss the results obtained by the CMS Collaboration on the performance of jets and missing transverse energy, with a focus on Run3 data.

This work presents dedicated jet energy calibration techniques developed for low pileup proton–proton collision data. The study focuses on adapting standard calibration procedures to the low pileup regime, where detector response and underlying event conditions differ significantly from nominal high-luminosity operations. We describe the methodology, including residual and relative...

Direct New Physics Search at the CEPC