第十届中国LHC物理会议（CLHCP2024 青岛）

HF overview

CPV and amplitude analysis

Since announcement of the muon g-2 anomaly, plenty of papers have devoted to this anomaly. The approximate formulae are always adopted when determining the new physics contributions, while clear scope of applications are always absent. This talk is dedicated to the comprehensive analytical results and approximations for the canonical interactions at one-loop level. We not only collect the...

A mechanism of generating CP violation through the imaginary part of the interference of two amplitudes is proposed. This mechanism has shown clear evidence in decays such as B±→π±π+π−. The proposed mechanism is helpful in searching for CP violation in bottom and charmed baryon decay processes.

This talk will focus on the study of CP violation in Flavor-Changing Neutral Current (FCNC) decays, exploring how these processes provide a sensitive probe for testing the Standard Model and searching for new physics. We will review key measurements and experimental techniques used to study CP violation in rare decays, highlighting recent results from the LHCb experiment and their implications...

We present a novel method to compute light-cone distribution amplitudes (LCDAs) of heavy meson defined in heavy quark effective theory (HQET). Our method utilizes quasi distribution amplitudes (quasi-DAs) with a large momentum component $P^z$. By sequentially integrating out $P^z$ and $m_H$, one can disentangle different dynamical scales. Integrating out $P^z$ allows to connect quasi-DAs to...

we would like to introduce our recent work about BSM Higgs searches at LHC, in the framework of 2HDM. The study will include both the neutral and charged Higgs studies. including various BSM Higgs production and decay channels, as well as the exotic Higgs decays.

We present the results for the complete next-to-leading order electroweak corrections to pp → HH at the Large Hadron Collider, focusing on the dominant gluon-gluon fusion process. While the corrections at the total cross-section level are approximately −4%, those near the energy of HH production threshold exceed +15%, and corrections at the high-energy region are around −10%, leading to a...

The production of exotic hadrons, such as $\rm X(3872)$, in $pp$ collisions at $\sqrt{s}=2.76\,\mathrm{TeV}$ is investigated by the parton and hadron cascade model {\footnotesize PACIAE}. In the simulation the final partonic state (Quark Matter, QM) and the final hadronic state (Hadron Mater, HM) are continuously processed and recorded. The $\rm X(3872)$ compact tetraquark state and loose...

Precise information on the Higgs boson self-couplings provides the foundation for unveiling the electroweak symmetry breaking mechanism.
Due to the scarcity of Higgs boson pair events at the LHC, only loose limits have been obtained.
This is based on the assumption that the cross section is a quadratic function of the trilinear Higgs self-coupling in the $\kappa$ framework.
However, if...

Jet Origin Identification (JOI), which classifies jets into five quarks, five anti-quarks, and gluons, was introduced and successfully implemented using ParticleNet, achieving unprecedented performance in measuring the rare and exotic decays of the Higgs boson at the proposed Circular Electron-Positron Collider (CEPC). Additionally, we developed a quantum-based jet clustering algorithm...

Based on arxiv:2407.08682, we present the More-Interaction Particle Transformer (MIParT), a novel deep learning neural network designed for jet tagging. This framework incorporates our own design, the More-Interaction Attention (MIA) mechanism, which increases the dimensionality of particle interaction embeddings. We tested MIParT using the top tagging and quark-gluon datasets. Our results...

The violation of Lam-Tung relation in the high-$p_T^{\ell\ell}$ region of the Drell-Yan
process at the LHC presents a long-standing discrepancy with the standard model prediction
at $\mathcal{O}(\alpha_s^3)$ accuracy. In this talk, we employed a model-independent analysis to
investigate this anomaly within the framework of the Standard Model Effective Field Theory (SMEFT).
Our findings...

High-accuracy theoretical predictions for the motion of compact binary systems are essential for maximizing the discovery potential of current and future gravitational-wave observations, such as LIGO-Virgo-Kagra, Taiji, TianQin, and Einstein Telescope. Modern theoretical tools initially invented for LHC physics, such as effective field theory and multi-loop Feynman integrals, has proven...

In this talk, we explore the electroweak phase transition in the real singlet scalar extension of the Standard Model through a nonperturbative lattice study. We examine both heavy and light singlet-like scalar scenarios, focusing on non-zero singlet-doublet mixing angles.

The presentation begins with an overview of the lattice methods relevant to phase transition analysis. We then analyze...

Collider tests of quantum entanglement (QE) and Bell nonlocality (BN) have offered a new opportunity for deepening our understanding on quantum mechanics. While most of the existing work on this topic has been focusing on parity (P) conserving interactions, I will address in this talk how P violation could change the spin correlations of the spin-half bipartite systems, thus modifying the...

Our study presents a comprehensive analysis of baryon number violation during the electroweak phase transition (EWPT) within the framework of an extended scalar electroweak multiplet. We perform a topological classification of scalar multiplet's representation during the EWPT, identifying conditions under which monopole or sphaleron field solutions emerge, contingent upon whether their...

I will review and discuss various approaches to probe the first-order electroweak phase transition at the colliders.

We illustrate that the leading-twist light-cone distribution amplitudes (LCDAs) defined in heavy-quark effective theory (HQET) can be determined through lattice simulations of quasi-distribution amplitudes (quasi-DAs) with a large momentum component $P^z$. Exploiting heavy-quark spin symmetry, we show that the LCDAs for a heavy pseudoscalar and vector meson in the context of HQET exhibit...

We investigate the Type-I Two-Higgs-Doublet Model (2HDM-I) as a potential explanation for the 95 GeV diphoton excess observed at the LHC, and assess the feasibility of discovering a 95 GeV Higgs boson at future hadron colliders. Our analysis shows that the direct Higgs search data strongly constrain the Higgs-mixing angle parameter. Subsequent collider simulations focus on the $pp \to t(\to...

Light-cone distribution amplitudes (LCDAs) frequently arise in factorization theorems involving light and heavy mesons. The QCD LCDA for heavy mesons includes short-distance physics at energy scales of the heavy-quark mass. We achieve the separation of this perturbative scale from the purely hadronic effects by matching the QCD LCDA to the convolution of a perturbative function with the...

Track and jet reconstruction are crucial components in high energy collider experiments. It is known for high consumption of computing resources, and various investigations are ongoing to cope with this challenge. These reconstruction tasks can be considered as quadratic unconstrained binary optimization (QUBO) problems, which are suitable to be solved with quantum algorithms. I will present...

Supersymmetric models with nearly-degenerate light higgsinos provide a consistent solution to the naturalness problem under rigorous constraints from current experimental searches for sparticles. However, it is challenging to probe the compressed scenarios at collider experiments due to the hard-to-detect soft final states. To overcome this issue, strategies have been proposed to take...

We propose to measure the energy correlator in quarkonium production, which tracks the energy deposited in the calorimeter $\chi$-angular distance away from the identified quarkonium. The observable eliminates the need for jets while sustaining the perturbative predictive power. Analyzing the power correction to the energy correlator, we demonstrate the novel observable supplies a unique...

We fit the invariant mass distribution of ${X(3872)}\rightarrow{J}/{\psi}\pi^+\pi^-$ from LHCb and ${X(3872)}\rightarrow{D}^{0}\overline{D}^{0*}$ from Belle using the propagator for S-wave threshold states in effective field theory. In this way, we can directly determine the $Z$ which is the probability of finding the compact component in ${X(3872)}$. We find that $Z$ is a non-vanishing value...

There are two common methods to compute the bubble wall velocity for the cosmological phase transitions: the fluid method, which analyzes the macroscopic fluid system, and the local Boltzmann equations; the microscopic method, which studies the force acting on the bubble wall by the multi-particle bubble interactions. However, those two methods are not consistent with each other. In this...

This study investigates the Multiple-Parton Interaction (MPI) sensitivity of several charged particle observables, including the charged pseudorapidity distribution, the average transverse momentum as function of charged multiplicity, and the production of individual particle species. The MPI effects on pentaquark production are also studied, for three possible resonance states, $P_c^+(4312)$,...

Supersymmetric signals have been widely searched for at the LHC, but unfortranately there are no obvious signals beyond the standard model have been found. Does the natural supersymmetry actually exist or not at the TeV scale， or did the experimentalists forget some important signals at the LHC? In this talk, I will introduce some of our previous works that focus on the long-lived SUSY...

The recent measurements of $h \to Z \gamma$ from ATLAS and CMS show an excess of the signal strength $\mu_Z = (\sigma\cdot{\cal B})_{\mathrm{obs}}/(\sigma\cdot{\cal B})_{\mathrm{SM}}=2.2\pm 0.7$, normalized as 1 in the standard model~(SM). If confirmed, it would be a signal of new physics (NP) beyond the SM. We study NP explanation for this excess. In general, for a given model, it also...