散射截面是研究粒子基本结构和相互作用的基本观测量。当散射过程涉及多个能标时，精确计算结果很难得到。当能标之比很大时，结果会展示出大对数结构。在领头幂次阶，该大对数已经了解的比较清楚了。但是在次领头幂次阶，会出现新的困难，例如端点发散。这时需要发展新的理论来处理这些困难。我将介绍这方面的最新进展。
A near-threshold peaking structure, dubbed X(3960), is observed in the Ds+Ds- mass spectrum with significance greater than 12 standard deviations, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. Its quantum numbers is measured to be J^{PC}=0^{++} with the amplitude analysis. It may be a candidate with the quark content: c cbar...
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.
The first discovery of pentaquarks at LHCb in 2015, opens new window to study QCD. The LHCb experiment has the large dataset and excellent detector performance in such searches. In this talk, the latest results on pentaquark study in B-meson decays from LHCb will be discussed.
We investigate the extent to which perturbative calculations of the electroweak phase transition are arbitrary and uncertain, owing to their gauge, renormalization scale and scheme dependence, as well as treatments of the Goldstone catastrophe and daisy diagrams. Using the complete parameter space of the Standard Model extended by a real scalar singlet with a Z2 symmetry as a test, we explore...
We calculate the s-wave scattering length in the $0^+$ sector of $\eta_c\eta_c$ and the $2^+$ sector of $J/\psi J/\psi$ using three $N_f=2$ twisted mass gauge ensembles
with the lattice spacing $a=0.0667,0.085,0.098$ fm, respectively.
The scattering lengths are extracted using the conventional L{\"u}scher finite size method. We observe significant discretization effects and therefore...
AMS自2011年开始在国际空间站上运行，迄今已在暗物质和反物质寻找、宇宙线研究取得重大成果，发现了许多不能被现有理论解释的新现象。美国白宫已于2021年12月31日宣布国际空间站将运行到2030年，并计划运行AMS直到国际空间站使命结束。为进一步提高AMS科学产出，理解已发现的新现象，特别是宇宙线正电子、反质子和高电荷原子核能谱的精确测量，更好地发挥在反物质等探索研究方面独到的优势，AMS实验计划于近期开始进行探测器升级，安装由两层共8平方米的硅微条探测器组成的Layer0硅径迹室。
中科院高能所将负责完成L0...
The three generations of leptons and quarkons have been discovered. The left-right asymmetry in the weak interaction of leptons and quarks has been confirmed. Astronomical observations have showed that the number of baryons and antibaryons is asymmetrical in the observabale cosmos. This paper shows that there is the same origin of the left-right asymmetry and the asymmetry of number of baryons...
BESIII has collected 2.93 and 6.32 fb^-1 of e+e- collision data samples at 3.773 and 4.178-4.226 GeV, respectively. We will report precision measurements of fDs, |Vcs| and test of lepton flavor universality by studying the leptonic decays of Ds -> l+nu with tau+ -> rho+nu, pi+nu, and e+nunu. We will also report the studies of Ds -> pi0pi0e+nu and KSKSe+nu, inclusive Ds semileptonic decay,...
This poster will present a measurement of the charge conjugation and parity ($CP$) properties in the Higgs boson interaction with $\tau$ leptons. The Yukawa interaction is generalized with a single mixing angle parameter $\phi_{\tau}$ to describe $CP$-odd interactions between the Higgs boson and $\tau$ leptons. The study is based on a measurement of $CP$-sensitive angular observables defined...
Lithium chloride water solution is a good option for solar neutrino detection. The $\nu_{e}$ charged-current (CC) interaction cross-section on ${}^{7}\mathrm{Li}$ is evaluated with new B(GT) experimental measurements. The total CC interaction cross-section weighted by the solar ${}^{8}\mathrm{B}$ electron neutrino spectrum is $3.759\times10^{−42}~\mathrm{cm}^{2}$, which is about $60$ times...
In the SM effective field theory (SMEFT), the gauge interactions can be extended by dimension-8 operators contributing to anomalous triple gauge couplings (aTGCs) and anomalous quartic gauge couplings (aQGCs). The VBS processes at hadron colliders and the tri-boson production at lepton-colliders are suitable for probing aQGCs, and the di-boson production at lepton-colliders is suitable for...
低温超导探测器基于热信号实现对粒子的能量测量，具有eV量级的能量分辨，相较于传统的半导体探测器，其能量分辨提高了一到两个量级，因此对能量分辨要求高的测量场景十分有利。该探测器同时具有无死层、吸收材料选型广泛、掺杂不敏感等特点，这也为实验测量带来了新的思路。本报告简要介绍国内该类探测器的发展现状，之后通过该探测器以铅210的能谱测量为例介绍该探测器在核素4Pi能谱测量方面的潜在应用。本报告最后针对该探测器特点，分析它在中子衰变末态束缚态测量方面的应用可能性。
We will report selected recent results of new physics searches at LHCb via the study of b-hadrons decays that are rare or forbidden in the standard model of particle physics.
Nuclear reactor safeguard, based on detection of electron antineutrino flux and energy
spectrum, is of great interests to both administrative agencies such as International Atomic Energy
Agency (IAEA) and neutrino community. A dominant reaction channel of such detection is inverse
beta decay (IBD), for which discrimination of gamma against neutron is critical. In this study, pulse ...
The Circular Electron Positron Collider (CEPC) is a large international scientific facility proposed by the Chinese particle physics community. The proposal of silicon photomultiplier (SiPM) coupling with the glass scintillator as the detection unit HCAL is a new solution for the next generation calorimeter. In order to achieve the goal of high density and high light yield of the glasses....
BESIII has collected 2.5 B $\psi(2S)$ events and 10 B $J/\psi$ events. The huge data sample provide an excellent chance to search for new physics in charmonium decays. We report the search for the decay $J/\psi\to\gamma + invisible$ and a potential light Higgs A0 in radiative J/psi decay. We also search for the J/psi rare weak decay to $D^-e^+\nu_e +c.c.$, and present the most stringent...
We accomplish the analytical computation of the pure weak annihilation non-leptonic $B$-meson decay amplitudes at leading power in the heavy quark expansion. The novel observation regarding such fundamental hadronic quantities is that adding the missing hard-collinear contribution on top of the hard gluon exchange effect eliminates rapidity divergences entering the convolution integrals of...
格点模拟为计算早期宇宙对称性破缺过程及其可能产生的随机引力波功率谱提供了可能，这为引力波探测实验提供了重要的随机引力波源，引力波探测实验可以和对撞机实验互补的来区分早期宇宙对称性破缺的模式及其背后的新物理。我将在此报告中和大家分享我们利用格点规范场论模拟早期宇宙对称性破缺过程所取得的一些进展，包括：强一阶电弱相变和宇宙弦形成等的研究。
We compute for the first time the long-distance penguin contribution to the double radiative $B$-meson decays
due to the purely hadronic operators acting with the electromagnetic current in the background soft-gluon field
from first field-theoretical principles by introducing a novel subleading $B$-meson distribution amplitude.
The numerically dominant penguin amplitude arises from...
在文章arXiv:2112.14215（李新强，沈萌，王东洋，杨亚东，袁兴博）和arXiv:2205.02205（李新强，谢泽俊，杨亚东，袁兴博）中，我们分别研究了用具有顶夸克味改变和味守恒中性流的$Z^\prime$模型来解释$b\to s \ell^+ \ell^-$反常。在后一工作中，我们还考虑了额外解释最近CDF观测到的W玻色子质量的可能性。
Using 980 fb-1 of data on and around the Υ(nS)(n=1,2,3,4,5) resonances collected with the Belle detector at KEKB, the two-photon process γγ-> γψ(2S) is studied from √s = 3.7 GeV to 4.2 GeV for the first time. Two structures with resonance parameters being measured are seen in the invariant mass distribution of γψ(2S). And the cross section of e+e- ->ηϕ via initial-state radiation are measured...
We have studied color-octet contributions for $J/\psi$ inclusive production at B factories, i.e., $e^+e^-\to J/\psi({^{3}\hspace{-0.6mm}P_{J}^{[8]}},{^{1}\hspace{-0.6mm}S_{0}^{[8]}}) + X_{\mathrm{non}-c\bar c}$, using the soft gluon factorization (SGF) approach, in which the $J/\psi$ energy spectrum is expressed in a form of perturbatively calculable short-distance hard parts convoluted with...
Weakly-Interacting-Massive-Particles (WIMPs) are a large class of viable dark matter candidates. We employ heavy particle effective field theory to compute general heavy electroweak multiplets and nucleon elastic scattering up to heavy mass $1/M$ order.
For certain electroweak multiplets, leading order effective theory calculation shows a generic amplitude-level cancellation that yields a...
研制成两种结构的含有10B2O3的微通道板成像探测器，即真空密封结构和敞开式结构，两者均采用含10B2O3的微通道板作为中子转换和较低增益的电子倍增，随后采用高增益微通道板来倍增前者的电子，采用超短余辉的P46荧光屏来实现成像，而真空密封结构采用石英玻璃作为窗口，在其上蒸镀多碱阴极，按照微光像增强器的工艺制作，由此可以确保倍增和成像系统质量合格，采用P46的荧光粉，为后续高速相机采集成像数据奠定技术基础。
We discuss the axion objects such as axion mini-clusters and axion clouds around spinning
black holes, which induce parametric resonances of electromagnetic waves through the
axion-photon interaction, as well as high frequency gravitational waves through gravitational Chern-Simons (CS) coupling. We also present some new detection schemes for axions and high frequency waves.
基于声子探测的新型荧光-热量双读出低温晶体量热器是近年新发展起来的革命性探测技术，具有极高的灵敏度，极低的探测器阈值（20eV），极好的能量分辨（FWHM 5keV@2615keV），独特的粒子鉴别能力，在低本底实验、稀有物理衰变中有广泛的应用前景。报告主要介绍在科大研制钼酸盐低温晶体量热器，在10mK深冷环境下，通过半导体声子传感器及科大自主研制的初级低温低噪声小信号电子学系统，成功读出宇宙线能量沉积产生的荧光-热量二维信号；及其后续优化升级计划，以期获得高性能低温晶体量热器及地面深冷测试平台。
At BESIII, the electromagnetic form factors (EMFFs) and the pair production cross sections of various baryons have been studied. The proton EMFF ratio |GE/GM| is determined precisely and line-shape of |GE| is obtained for the first time. The recent results of neutron EMFFs at BESIII show great improvement comparing with previous experiments. Cross sections of various baryon pairs (Lambda,...
中微子质量问题是粒子物理标准模型现有的重大问题之一。利用含有右手中微子的跷跷板机制可以解释该问题，同时右手中微子又可以通过轻子生成机制解释宇宙正反物质不对称，因此寻找右手中微子是一个极具吸引力的课题。然而，对撞机实验在框架下无法直接寻找到右手中微子检验跷跷板机制。我们基于模型，研究了该模型额外的右手中微子产生通道。利用其独特的长寿命粒子信号，我们进行了对撞机唯象学分析，发现在一定参数空间内，可以成功检验跷跷板机制。与此同时，额外的右手中微子产生通道在轻子生成机制中，能够产生强烈的冲刷项，大大减少产生的正反物质不对称。所以对撞机寻找该通道也能够检验轻子生成机制。
With the large datasets on 𝑒+𝑒−-annihilation at the 𝐽/𝜓 and 𝜓(3686) resonances collected at the BESIII experiment, multi-dimensional analyses making use of polarization and entanglement can shed new light on the production and decay properties hyperon-antihyperon pairs. In a series of recent studies performed at BESIII, significant transverse polarization of the (anti)hyperons has been...
By adopting a non-relativistic (NR) reduction method, we study the one-fermion matrix elements between the fermion-gravity and the fermion-photon interactions in the presence of the minimal Lorentz-violating (LV) fermion coefficients. We prescribed the Lense-Thirring (LT) metric with the test particle assumption, as this metric is essentially curved and may demonstrate some novel LV...
利用电子加速器光中子源来开展融合中子与X射线的双模成像已被证明是一种可行的方法。在已有的技术方案中，我们采用基于“nMCP+闪烁屏+CMOS”的方案来测量中子图像，成功获得了中子/光子融合图像并实现了双模物质识别，但同时也注意到了该探测方案所遇到的两个技术困难：（1）X射线脉冲对中子探测的干扰和（2）探测器级联过程导致的统计性恶化。为此，研究了基于event-count模式的nMCP探测器来开展光中子成像的问题，通过设置优化的实验条件，在强X射线干扰场下，得到了信本比较高的中子图像，可在相对更短的时间内获得更好的图像质量，为基于event-count模式nMCP探测器的双模成像方法奠定了基础。本报告将对光中子成像的技术原理和nMCP探测器的成像方法开展介绍。
Weak radiative hyperon decays, important to test the strong interaction and relevant in searches for beyond the standard model physics, have remained puzzling both experimentally and theoretically for a long time. The recently updated branching fraction and first measurement of the asymmetry parameter of $\Lambda\to n\gamma$ by the BESIII Collaboration further exacerbate the issue, as none of...
The energy correlators measure the pattern of the energy deposition in detectors. The collinear limit, where the angle between the detectors approaches zero, is of particular interest for describing the substructure of jets produced at colliders. By utilizing our factorization theorem and calculating the required ingredients, we perform the resummation of the logarithmically enhanced terms for...
Measuring the properties of hadrons in the non-perturbative QCD energy region is one of the powerful tools to understand the hadron structure and strong interaction. We propose to measure the spatial extent of intermediate baryon resonances and of hadron reaction volume in the non-perturbative QCD energy region. A new method is developed to measure the spatial extent of the $\Delta$(1232)...
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.
未来电子对撞机将带来前所未有的精确实验结果，这有助我们加深对标准模型的理解以及寻找新物理。为了给出高精度理论预言，我们需要将微扰论计算推进到更高阶,其核心在于费曼积分的计算。我会在报告中介绍当前计算费曼积分的主流方法、发展以及在物理过程中的应用。
在过去二十年里，现代散射振幅理论发展了许多新的方法，在计算和理解量子场论中与散射过程相关的可观测量方面也得到了许多新的结果，它们为许多高能物理现象提供了更为精确的理论预言与解释。而近些年，起源于上个世纪S-matrix program思想的自举(bootstrap)方法，在计算场论中的物理量方面有一些重要的进展。要计算量子场论中的物理量，往往需要大量极其繁琐的中间步骤，而最终结果有时是极其简单的。因此，自举方法的主要思想，便是通过合适地假设具有一般形式的结果，再利用一些已知的物理约束，直接限定得到最终结果，从而省去了不必要的中间过程。除此之外，不同理论往往满足一些普适的物理约束，这能用于解释不同理论结果之间的唯一性，例如最大超越度原理。这一原理是指，在最大超对称杨-米尔斯理论(N=4...
The first observation of the electroweak (EW) production of a Z boson, a photon, and two forward jets (Z$\gamma$jj) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. A data set corresponding to an integrated luminosity of 137 fb$^{-1}$, collected by the CMS experiment at the LHC in 2016-2018 is used. The measured fiducial cross section for EW Z$\gamma$jj is...
Pion and Kaon Distribtuion Amplitudes from Lattice QCD
This talk contains two parts, the first part is Partonic Collinear Structure by Quantum Computing and the second part is Exploring Light-Cone Distribution Amplitudes from Quantum Computing.
In the first part, we present a systematic quantum algorithm, which integrates both the hadronic state preparation and the evaluation of the real-time light-front correlators, to study parton...
Energy Correlators (EEC) have recently received great interest both theoretically and experimentally. In particular, the study of EECs in jet substructure has gained deeper understanding with the advent of the light-ray operator product expansion. In this talk, based on this progress, we propose a ratio observable named “celestial non-gaussianity”, which roughly is the ratio between...
Dyson-Schwinger 方程 (DSEs) 已被广泛地应用于轻+轻、轻+重和重+重介子性质的研究。基于此方法，我们对轻+重介子的每个半轻衰变的形状因子和衰变宽度进行了计算，包括 B_((s))→π(K), D_s→K; D→π,K, K→π 和 B_c→η_c, 𝐽/𝜓。在这些计算中，我们的结果定量地与现有数据一致，并分析了迄今未测量的 D_s→K^0, B ̅s→K^+形状因子。分析给出|𝑉𝑐𝑠 | = 0.974(10)，并预言了赝标量介子的所有分支分数比，如B_c→η_c, 𝐽/𝜓 的分支分数比，即𝜏和𝜇末态分支比的比值: R(η_c )= 0.313(22)和R_(J/ψ)= 0.242(47)，可以探讨轻子味道的普适性问题。我们的分析证实了标准模型对 R_(J/ψ) 的预言与唯一的实验结果之间存在2𝜎的差异，需要实验进一步验证。
$\gamma W$ -box图修正是电弱辐射修正中对强子尺度敏感的唯一项, 且对强子尺度敏感. 我们组将格点QCD引入$\pi$介子的辐射衰变修正计算中, 在计算中结合格点理论和微扰论, 将理论计算的不确定度降低为原来的1/3. 此外, 这一计算方案还可以在味SU(3)极限下推广到K介子衰变的辐射修正的计算中. 结合手征微扰论, 我们的计算方案可以给出又良好不确定度估计的低能有效常数的结果.
我们报告的主要内容是利用格点QCD非微扰地计算含有弱衰变的双重子矩阵元的方法以及初步结果，主要包括质子。近年来无中微子双beta衰变实验备受关注，虽然实验观测大多使用较重的原子核，直接使用格点QCD计算并不现实，但我们计算出的相关双重子弱衰变矩阵元能够以有效场论为桥梁为核多体计算提供2体算符的输入，而这也是目前核多体第一性原理计算中的主要误差来源之一。目前已发表的相关结果比较少，NPLQCD合作组在2017年给出了双质子融合和双中微子双beta衰变的结果，而无中微子双beta衰变方面目前只有pi介子的计算结果。我们目前的得到的$g_A$以及双质子融合矩阵元、双中微子双beta衰变矩阵元的初步结果与前人工作相符，无中微子双beta衰变矩阵元有待进一步研究。
近年来，硅光电倍增器（SiPM）作为光电倍增管（PMT）的替代用于闪烁体读出得到广泛应用。SiPM具有和PMT相当的增益，但具有高量子效率、低偏置电压、小体积、高强度和磁场兼容性等优点，缺点是暗噪声大、动态范围小。由于单片SiPM面积较小（目前最大6mmx6mm），用于英寸尺度的闪烁晶体读出时需要采用多个SiPM组成阵列，SiPM的暗噪声以及大电容是影响测量的关键因素。在本文中，采用SiPM阵列作为闪烁体读出，针对多种不同的晶体（NaI(Tl)、SrI2、CLYC、EJ-276、EJ-301、NaIL等）用于伽马能谱测量以及伽马/中子粒子甄别等应用，结合优化设计的电路，对能量分辨率、线性度、脉冲波形甄别性能等开展了系统研究，并与PMT的测量结果进行比较。实验结果表明，SiPM阵列用于闪烁体读出，在能量分辨率和脉冲波形辨别上可以实现和PMT读出相当的性能，为小型化仪器设计提供了重要参考。
中国极化电子-离子对撞机（EicC）项目是设想在将来建好的强流重离子加速器（HIAF）的基础上，进一步升级改造为电子-离子对撞机，为我国核物理和粒子物理以及相关科学领域提供大型综合实验平台。电子-离子对撞机，被称作当代卢瑟福散射实验，是人类认识物质世界深层次结构的理想工具。EicC实验将聚焦在研究核子的内部结构，尤其是海夸克部分子的分布，以及原子核内部的核子短程关联以及原子核介质的强相互作用性质。此外，EicC在研究研究重味奇特强子谱方面也具有独特的优势，这对于我们理解这些奇特强子态的性质具有极大的帮助。在本报告中，我将主要介绍EicC预研进展及在核子结构及强子物理方面的前景。
The collider experiment is the most effective means in recent years to verify the standard model and find new physics. The discovery of the Higgs in 2012 by the Large Hadron Collider (LHC), currently operating at CERN, completed the final piece of the standard Model puzzle.
Measuring the longitudinal polarization of the vector boson scattering process is an important way to explore the Higgs...
The newly reported $\eta_1(1855)$ with $J^{PC}=1^{-+}$ is interpreted to
be a dynamically generated pole in $f_1(1285)\eta-K_{1}(1400)\bar{K}$
scattering with Weinberg-Tomozawa term serves as interaction.
When $a_1-\pi$ mixing in axial meson dominance model is included,
the ratio in $\eta_1(1855)$ decaying into
final states $\eta \eta^{\prime}$ and $K^{\ast}\bar{K}\pi$ is...
This talk will present the HH-->4b analysis result at ATLAS and also the exotic decays of 125GeV SM Higgs to light scalar pairs in 4b final states with future circular colliders such as CEPC.
The spectrum of mesons with mass less-than 2 GeV, especially those with strangeness, is poorly understood - both experimentally and theoretically. We address this issue by employing a novel method for constructing a kernel for the meson bound-state problem. The scheme produces a closed-form kernel that is symmetry-consistent (discrete and continuous) with the gap equation defined by any...
We proposed a recipe to systematically calculate Feynman integrals containing linear propagators using the auxiliary mass flow method. The key of the recipe is to introduce a quadratic term for each linear propagator and then using differential equations to get rid of their effects. As an application, we calculated all master integrals of vacuum integrals containing a gauge link up to four...
俄罗斯重离子对撞机NICA上的多功能探测器（Multi Purpose Detector，MPD）实验是中俄重大合作项目。清华大学工程物理系与国内几所高校基本完成了该实验中电磁量能器（Electromagnetic...
At BESIII, the R value is measured with a total of 14 data points with the corresponding c.m. energy going from 2.2324 to 3.6710 GeV. The statistical uncertainty of the measured R is less than 0.6%. Two different simulation models, the LUARLW and a new Hybrid generated, are used and give consistent detection efficiencies and initial-state-radiation corrections. An accuracy of better than 2.6%...
许多新物理模型预言了荷电规范玻色子W'的存在，其会引起荷电非标准中微子相互作用（CC NSI）。我们首先关注低能实验数据对新规范玻色子W'引起的CC NSI的约束。其次在简化的W'模型中分别从微扰幺正性和W'衰变两个方面考虑CC NSI参数的理论约束，通过蒙特卡洛模拟，研究了大型强子对撞机的pp→lν过程和电子-质子对撞机的ep→νej过程对CC NSI参数的预期约束。我们发现对撞机实验可以为研究NSI效应提供令人兴奋的前景，这也将有利于在对撞机中探索超出标准模型的新物理理论。
含时达利兹分析方法是研究D0-D0bar混合和CP破坏的重要研究手段。考虑Belle II计划
采集的50 ab-1数据的D0/D0bar样本大小，目前没有发表的模型依赖的含时达利兹程序包，我们
需要提高模型依赖的含时达利兹分析速度。根据Hydra分析框架，我们研发C++的含时达利兹分析
程序包DAFNE。根据Belle的953fb-1数据，采用达利兹分析方法研究D0->K- pi+ eta，通过
K pi/eta不变质量谱研究K*激发态。
We discuss a possibility that a superconformal dynamics induces the emergence of a global U(1)PQ symmetry to solve the strong CP problem through the axion. Fields spontaneously breaking the U(1)PQ symmetry couple to new quarks charged under the ordinary color SU(3)C and a new SU(N) gauge group. The theory flows into an IR fixed point where the U(1)PQ breaking fields hold a large anomalous...
K物理，尤其是稀有K介子衰变，因为其实验上有相对干净的分支比、理论上涉及到味道改变中性流和CP破坏等对新物理十分敏感的物理过程，而十分适合于精确检验标准模型和探寻标准模型之外的新物理。为了达到这个目标，我们需要解决目前主要的理论不确定度的来源：与低能非微扰QCD相关的长程贡献计算。近年来，格点场论方法从第一性原理QCD出发，在稀有K介子衰变的长程贡献计算上扮演越来越重要的角色。在本工作中，我们提出一套创新的格点计算方案“无穷体积轻子方法”，系统地回答了如何计算末态较为复杂的K介子衰变过程的问题，并解决了其中涉及到的各种系统误差。该方案可以广泛地运用于各类稀有衰变过程，从而拓展了格点场论能处理的问题的范围。作为新方法的探索性尝试，我们以K的四轻子稀有衰变过程为例进行研究，得到了可以和实验与手征微扰论相比较的计算结果，验证了该方案的有效性。
We calculate the resummed perturbative free energy of N = 4 supersymmetric Yang-Mills in four spacetime dimensions $SYM_{4,4}$ through second order in the ’t Hooft coupling λ at finite temperature and zero chemical potential. Our final result is ultraviolet finite and all infrared divergences generated at three-loop level are canceled by summing over $SYM_{4,4}$ ring diagrams. Non-analytic...
In this talk, I will present our recent work [arXiv: 2201.11905] about detecting the dark magnetic dipole through fermionic dark matter (DM) absorption. In this work, we propose a Dirac fermion DM charged under a dark gauge group and with the dark magnetic dipole operator. Under the mixing of DM and right-handed neutrino, it induces the process that the incoming DM is absorbed and converted...
The renormalization constant of the flavor-singlet axial-vector current operator with a non-anticommuting $\gamma_5$ in dimensional regularization is determined to order $\alpha_s^5$ in QCD with massless quarks. The result is obtained from a four-loop calculation by the virtue of a formula derived using the Adler-Bell-Jackiw equation in terms of renormalized operators. A possible application...
We establish a formal notion of genericity, expressed as an equality for derivatives of the generic property function to parameters of the models. We apply this notion to generic Wess-Zumino models with R-symmetries, where we show that the superpotential vanishes term-by-term at a supersymmetric vacuum. This work is published in JHEP 12 (2021) 199.
高能实验中，相比于量能器，trackers上的测量具有更好的角度分辨率、能消除pileup，使得测量结果更精确。但理论微扰计算中，只考虑带电粒子（tracks）的观测量不是红外安全的，这说明基于带电粒子的观测量的计算需要考虑非微扰效应。所以，一个类似于碎裂函数的非微扰量被引入进来，称为track function，它能吸收微扰计算部分的红外发散。与碎裂函数不同的是，track function描述的是从一个硬部分子形成的喷注中带电强子的总能量分布，而不仅仅是单个强子的能量分布，这使得track function的重整化群演化形式比碎裂函数的要复杂，是非线性的。我们获得了track...
N$\nu$DEx is a recently proposed experiment to search for the neutrinoless double beta decay of $\mathrm{^{82}Se}$ with high pressure $\mathrm{SeF_{6}}$ gas TPC. The readout plane made of Topmetal-S chips is the key to achieve the desired 1\% FWHM energy resolution.
Two versions of the Topmetal-S chips, featuring the capability of direct ion charge detection without avalanche gain, have...
通过研究谱仪类大科学装置，如同步辐射光源和散裂中子谱仪的运作和数据流特征，对状态监测和数据处理业务进行抽象建模和流式适配。突破传统的基于文件方式的数据传输和分析瓶颈，以高性能分布式数据传输平台和自研分析平台承载各类中子谱仪数据流，聚合不同来源的测量数据和其他实验参量，为谱仪实验提供基于数据驱动的高性能准实时数据流处理平台。最终实现信息域深度挖掘、智能化运维管理和准实时性的数据分析，帮助谱仪从各种多模态实验方法中准确鉴别和定位测量信号量，为新兴的大数据实验方法提供基本支撑。
There are now two single measurements of precision observables that have major anomalies in the Standard Model:
the recent CDF measurement of the $W$ mass shows a $7\sigma$ deviation and the Muon $g-2$ experiment at FNAL confirmed a long-standing anomaly, implying a $4.2 \sigma$ deviation.
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Doubts regarding new physics interpretations of these anomalies could stem from uncertainties in the...
Georgi-Machacek model can hardly account for the new CDF II data on W-boson mass in its original form. As anticipated, unless additional tree level $SU(2)_c$ custodial symmetry breaking effects are non-negligible, the new physics contributions to $\Delta m_W$ is always very small. Our numerical results show that ordinary GM model can contribute to $\Delta m_W$ a maximal amount $0.0012$ GeV,...
伽马射线极化是伽马天文研究的前沿领域，对于认知伽马射线源的产生机制以及寻找轴子、暗光子等新物理具有重要意义。AMS实验可以通过光子在探测器中转换为正负电子对的过程高精度的重建伽马射线的能量、方向，顶点重建算法是该研究的基础。本报告将介绍基于Cellular Automaton网络的伽马宇宙线事例顶点重建算法，分析该算法对光子重建效率的提升，以及在200MeV至TeV能量范围内AMS伽马射线极化的研究进展。
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.
This talk will present the latest searches for Mono-H125 and Mono-Scalar productions with SM and BSM Higgs 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.
