高能环形正负电子对撞机（Circular Electron Positron Collider, CEPC）的顶点探测器，对于重味夸克重建与分辨至关重要。为了实现高精度的物理测量，对内层顶点探测器的物质量、空间分辨率、读出速度以及功耗等方面的性能提出了严苛的要求。为研制顶点探测器原型样机，研发团队研发一款名为TaichuPix的单片式像素探测器芯片，旨在实现优于5 微米的空间分辨率，抗总剂量辐照能力超过1 Mrad，并兼顾 CEPC 顶点探测器的最高击中率需求。TaichuPix芯片基于180 nm CMOS工艺研制，目前已经完成两版小规模原型芯片(25 mm2)和一版全尺寸原型芯片（~ 4 cm^2）的设计和验证。本报告将介绍...
位于磁场上游的径迹探测器Upstream Tracker（UT）是LHCb探测器重要组成部分，对提高长寿命粒子重建效率和长径迹匹配速度至关重要。为发掘高亮度LHC上重味物理研究潜力，LHCb计划在2033年前后进行二期升级，以实现在$1.5 \times 10^{34} cm^{-2}s{-1}$亮度下运行的目标。现有UT须升级为颗粒度更高、抗辐照性能更强的像素型探测器。本报告将介绍目前可行的MAPS技术选项，基于CMOS的初步系统设计和探测器模拟，以及初步的性能研究。
未来对撞机实验上通常需要大面积、高空间分辨率、良好时间分辨及抗辐照的带电径迹探测系统，如环形正负电子对撞机、LHCb升级等。高压CMOS具有良好抗辐照性能、快速电荷收集，且可利用成熟的商用CMOS工艺。本报告将介绍探索先进的55nm高压CMOS工艺、用于粒子探测传感器的研发情况。基于Low-Leakage 55nm的COFFEE1芯片达到8-9V击穿电压，并观察到对激光信号响应。基于High-Voltage 55nm的COFFEE2芯片加入了像素内放大器和比较器电路，传感器达到70V击穿电压。其他测试正在进行。
In this study, the canonical formulation of the spin hydrodynamics of Dirac fermions is examined within a power counting scheme, where the spin variables are considered to be at the same order as the conventional hydrodynamic variables. An entropy-current analysis with a general spin potential reveals the importance of incorporating both the three components of spin density associated with...
The Phi meson and Omega baryon provide unique probes of the properties of the quark-gluon plasma (QGP) at hadronization in relativistic heavy-ion collisions. Using the quark recombination model with the quark phasespace information parameterized in a viscous blast wave, we perform Bayesian inference of the shear and bulk viscosities of the QGP at hadronization with a temperature of T ≈ 160 MeV...
Measurements of charm-strange meson and charm-baryon production in pp and heavy-ion collisions at the LHC are fundamental to investigate the charm-quark hadronisation across collision systems.
In this contribution, the final results of the ALICE Collaboration on the production of strange ($\mathrm{D_s}^+$ , $\Xi_\mathrm{c}^{0,+}$, $\Omega_\mathrm{c}^0$) and non-strange ($\mathrm{D}^0$ ,...
飞行时间探测器是大型核与粒子物理实验的重要组成部分。正在建设的低温高密核物质谱仪（CEE）中，飞行时间探测器包括内部飞行时间探测器（iTOF）和端盖飞行时间探测器（eTOF），二者均采用气隙电阻板室（MRPC）技术制造。对于电子学，要求实现最高~10 ps的时间测量精度。本报告将介绍基于放大甄别结合高精度时间数字变换技术的高精度时间测量电子学系统设计、电子学与探测器联合测试以及束流测试等最新进展。
NνDEx（No Neutrino Double-beta-decay Experiment）是基于高压气体时间投影室（Time Projection...
At leading order in QCD coupling constant, we compute the energy loss per traveling distance of a heavy quark $dE/dz$ from elastic scattering off thermal quarks and gluons at a temperature $T$, including the thermal perturbative description of soft scatterings ($-t<-t^{\ast}$) and a perturbative QCD-based calculation for hard collisions ($-t>-t^{\ast}$). Within this soft-hard factorization...
即将于2025年建成的强流重离子加速器（High Intensity heavy-ion AcceleratorFacility, HIAF）上包含了一条放射性次级束分离线（HIAF FRagment...
The longitudinal spin transfer represents the probability density of producing longitudinally polarized hadrons from longitudinally polarized quarks or circularly polarized gluons. It thus was usually measured in polarized reactions or high-energy collisions where weak interaction dominates. In this work, we propose the dihadron polarization correlation as a novel probe of this quantity. Such...
In-jet production is a useful tool to separate the contribution from the hard processes and the underlying events. In this letter, we find the in-jet requirement enhances the heavy flavor baryon-to-meson ratio more when a color re-connection mechanism (CR mode2) describes hadronization in p+p, which is opposite to the light flavor case. It indicates the hard process contribution alone will...
Particles associated with the jet will be deflected from their initial direction due to the scatterings with the thermal partons flowing in the QGP fluid. Such deflections depend on the energy of the jet, the local energy gradient, and the local flow velocity. In general, the soft particles will drift towards the direction of the flowing medium, away from the center of the jet cone where the...
可重构ADC（time-to-digital converter, ADC) 系统具有灵活可重构与高集成度的特点，通过进行编程，便可使该系统应用于新的实验场景，因此这种电子学读出系统受到了高度的关注。我们将描述一种新型的可重构ADC系统，该系统是一种基于时间数字转换器（time-to-digital converter, TDC）的软核ADC系统。其中ADC功能是在FPGA中实现的。
在硬件设计中，基于FPGA的ADC（FPGA-ADC）只需要一个额外的电阻和一块FPGA。FPGA-ADC允许用户对其采样率进行编程，并只需通过小的修改（调整电阻值）来调整ADC的输入电压范围。这种FPGA-ADC设计具有灵活可重构和高密度的特点，可以极大减小读出电路的尺寸。
探测器部分使用了两个测试单元。每个单元包含一个1.535 mm×1.535 mm x 20 mm...
理解强相互作用物质的性质及其相结构对于我们深入认识宇宙演化和可见物质结构具有重要科学意义。近二十年来，高能重离子碰撞实验中观测到了许多间接证据表明强相互作用夸克-胶子等离子体（sQGP）的存在。因此，探索高重子密度下的量子色动力学（QCD）相结构，特别是寻找一阶相变边界和QCD临界点在相图中的位置，成为高能核物理研究的重要目标之一。从2010年到2021年，RHIC-STAR实验分两个阶段完成了能量扫描计划，收集了质心能量从200 GeV到3 GeV下金核-金核碰撞实验数据。本报告将讨论在RHIC能量扫描计划中(BES-I&BES-II)关于QCD相图和相变临界点的实验研究进展。
基于声子探测的新型荧光-热量两维读出低温晶体量热器因其高能量分辨率、独特粒子鉴别能力等优势成为寻找无中微子双贝塔衰变最有竞争力的探测技术之一。报告主要介绍新型钼酸盐晶体生长、小尺寸钼酸盐低温晶体量热器研制及10mK深冷低温读出测试、以及地面测试系统与屏蔽体设计等。
We propose to use slow muons facilities combined with cyclotron radiation detection for precision test of the weak interaction in the muon decays. Slow positive muon bunches are first injected into a cylindrical superconducting vacuum chamber with uniform strong axial magnetic fields to radially confine the muons. The positrons resulting from muon decays can be detected by their cyclotron...
Searching the QCD critical point is one of the most important goals of the relativistic heavy-ion collisions. It is essential to build a realistic dynamical model near the QCD critical point and predict the characteristic signature induced by critical fluctuations in experimental measurements. By studying the dynamics of the conserved net-baryon density near critical point, it was found that...
In this work, we extend the two-flavor Nambu--Jona-Lasinio model to one capable of exploring quark and nuclear matter consistently. With an extra term standing for quark-nucleon interactions, nucleons could automatically emerge as color-singlet three-quark entities by following a process similar to mesons. Besides the quark part in mean field approximation, both mesons and nucleons could...
正负电子对撞实验是开展粒子物理前沿研究的重要平台。高亮度意味着更多有效物理数据，实现更高的峰值亮度和积分亮度是取得新的物理突破的有效手段。触发系统是整个数据获取与处理流程的第一步。随着亮度和物理事例率的提升，实验对触发率、本底水平、触发延迟的需求也不断升高，需结合超高亮度实验环境设计并实现全新的高性能触发系统。超级陶粲装置是我国提出研究的GeV能区超高亮度正负电子对撞实验，我们基于此平台设计了新的触发系统并通过模拟、实验等方式研究其性能优化方向，以期为下一代高亮度正负电子对撞实验的触发系统开拓新的研究方向。
Fluctuations and correlations of conserved charges are sensitive observables to study QCD phase structure. In particular, the baryon-strangeness correlations may be used to study the change of phases in the matter created in heavy-ion collisions.
In this work, we present the measurement of baryon-strangeness correlations in Au+Au collisions from beam energy scan program at STAR. This is...
磁单极子作为大统一理论预言的基本粒子，在解释电荷量子化和宇宙暴胀模型等方面扮演着至关重要的角色。SCEP实验组提出了一种基于室温线圈和塑料闪烁体的符合探测手段，用以探测磁单极子。其中利用线圈探测的基本原理是通过探测磁单极子穿过线圈时产生的感应信号，这对信噪比有着严格的要求。为此，SCEP实验组提出了两种探测感应信号的方案——ADC读出方案和磁力仪读出方案。本报告将围绕这两种方案展开，介绍它们的基本结构，并详细阐述感应信号及各部分噪声的特征。为了提高信噪比，我们进行了初步的优化设计，并给出了最终的预期信噪比。
COMET实验致力于使用高强度缪子束流寻找μ-e转换这一带电轻子味破坏过程，并预期将现有结果提升两到四个数量级。COMET合作组进行了Phase-alpha阶段的预研，为了对缪子束斑的结构进行监测，我们开发了一款基于塑料闪烁光纤和硅光电倍增器的缪子束流监测探测器，对缪子束流的时间和束斑结构进行了测量。为适应后续实验中更高强度的缪子束流，探测器目前正在进行升级开发。
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). A new timing detector in CMS will measure minimum ionizing particles (MIPs) with a time resolution of ~40-50 ps per hit and coverage up to |η|=3. The precision time information from this MIP...
With experimental data of DIS involving transversely polarized proton, we have calculated the 3-D charge density inside a polarized proton, which is found to have a significant non-spherical symmetry. Then we have calculated the properties of E-M field generated by a single transversely polarized proton. Based on them, the E-M field generated in small collision system p+A which involving a...
LGAD是一种新型半导体定时探测器。通过优化灵敏区厚度和内部增益，可以实现几十皮秒的时间分辨率。自提出以来，LGAD技术得到了广泛的关注，发展非常迅速。目前，LGAD已经成为较为成熟的探测器技术，被大型强子对撞机（LHC）的CMS和ATLAS实验phase 2升级项目采用。采用交流感应的方式引出信号，可以实现更灵活的电极排布，减小无增益区域，在保持高时间分辨率的基础上，进一步提高位置分辨率。本报告将综述国内外LGAD探测器的研发近期的进展情况，并展望未来可能的发展方向和应用场景。
The LHC will resume operations in 2026, entering the High Luminosity (HL-LHC) era. MTD (MIP Timing Detector) is a pivotal component in the HL-LHC CMS upgrade, promising a remarkable enhancement in time resolution to 30 ps. In the part of the BTL (Barrel Timing Layer), we have formulated a comprehensive research and development plan, along with an assembly and testing strategy for the Sensor...
With an electron-positron collider operating at center-of-mass-energy 2∼7 GeV and a peak luminosity above 0.5 × 1035 cm−2 s−1, the STCF physics program will provide an unique platform for in-depth studies of hadron structure and non-perturbative strong interaction, as well as probing physics beyond the Standard Model at the τ-Charm sector suceeding the present Being Electron-Positron Collider...
液体闪烁体是中微子实验中最常用的探测介质，精确重建液闪中事例的能量和位置对于粒子鉴别和提高信噪比等至关重要。我们引入对暗噪声的考虑，建立了点源响应与暗噪声的混合模型，未来也可以推广到闪烁光与切伦科夫光的混合、多个点源的混合模型。基于该混合模型，利用马尔可夫链蒙特卡罗方法（MCMC）将光电子和顶点位置及时刻的后验分布采样进行链式对接，将波形分析和事例重建联合起来。这种联合重建方法能够更精确地估计光电子数和位置，从而显著提高能量分辨率。我们的方法已经在锦屏中微子实验（JNE）的事例重建上取得了初步结果。通过采用这种重建方法，可以推动我们对中微子物理的理解，并提高未来实验的准确性。
$~~~~$PHENIX experiment group points out that in the measurements of the $\pi^0$ nuclear modification factor $R_{dAu}^{\pi^0}$, $\langle N_{\rm coll} \rangle$ can be biased by the event-selection [1], which can be effectively reduced by using the direct $\gamma$ yield at large $p_{\rm T}$ to determine the $\langle N_{\rm coll}^{\gamma} \rangle = {\rm Y}_{dAu}^{\gamma^{\rm dir}}/{\rm...
在高亮度对撞环境下，未来的粒子物理实验将面临前所未有的空间兼时间上的高堆积率和高本底率。例如，在 HL-LHC 上，质子质子对撞的平均堆积水平（pile-up）将达到 200，是 LHC 上的三倍多。通过联合的高精度位置和时间测量信息对堆积的物理信号和本底信号进行精确“拆分”，是未来高亮度对撞机实验的谱仪系统的关键技术之一。例如，在 HL-LHC 阶段，ATLAS...
高能宇宙辐射探测设施(HERD)是计划部署在中国空间站上的科学装置，它的主要科学目标包括间接探测暗物质、精确测量宇宙线能谱以及高能伽马射线巡天观测。HERD离线软件(HERDOS)是整个实验的重要组成部分，主要负责离线数据处理，包括蒙特卡洛模拟、刻度、重建和物理分析等。HERDOS以我国自主研发的轻量级的SNiPER软件框架为基础，同时利用了一些高能物理中最先进的第三方软件，例如DD4hep、podio、TBB等。
本文将概述HERDOS的设计和实现细节，具体将讨论以下内容：
1.基于podio设计的事例数据模型(EDM)，以及通过整合SNiPER和podio实现的数据管理系统(DMS)。
2.基于SNiPER和TBB实现的并行化的数据管理系统，包括基于podio开发的GlobalStore，以实现并发数据访问和数据输入输出。
3.基于MT-SNiPER开发的并行化的探测器模...
We demonstrate the recently proposed nucleon energy-energy correlator (NEEC) fEEC (x, θ) can unveil the gluon saturation in the small-x regime in eA collisions. The novelty of this probe is that it is fully inclusive just like the deep-inelastic scattering (DIS), with no requirements of jets or hadrons but still provides an evident portal to the small-x dynamics through the shape of the...
Modern particle physics experiments usually rely on highly complex and large-scale spectrometer devices. In high energy physics experiments, visualization helps detector design, data quality monitoring, offline data processing, and has great potential for improving physics analysis. In addition to the traditional physics data analysis based on statistical methods, visualization provides unique...
原初电离计数方法是具有突破性的下一代粒子物理实验探测器方法，它通过测量带电粒子在气体径迹探测器中的原初电离数目（dN/dx），实现带电强子的鉴别。与传统电离能损（dE/dx）方法相比规避了测量中的多项涨落，理论分辨率有潜力比dE/dx好两倍，是下一代先进探测器技术的有力候选。对于漂移室的 dN/dx...
Nucleon spin structures and opportunities at EicC
In this talk I will review our recent efforts to understand the polarized Transverse-Momentum-Dependent fragmentaion functions (TMD FFs) . Recent BELLE results on $\Lambda/\bar\Lambda$ polarization in $e^+e^-$-annihilations stimulate a series of progress from several groups to understand the polarized TMD FF $D_{1T}^\perp$. Based on the fundamental isospin symmetry of QCD, we propose a new...
超级陶粲装置（STCF）是中国正在筹划的新一代正负电子对撞机，是研究宇宙中正反物质不对称、探索强子内部结构、寻找奇特态强子和新物理的独特平台。粒子鉴别（PID）作为STCF实验中各种物理研究中最基本的工具之一，对于实现STCF的各种物理目标至关重要。在最近几十年中，机器学习（ML）逐步成为高能物理实验中粒子鉴别的强大替代方法。ML算法，例如神经网络和提升决策树，在处理复杂和多维数据方面表现出卓越性能，所以它们非常适合整合来自多个子探测器系统的粒子鉴别信息。在这项工作中，我们提出了一种基于ML技术的强大PID软件，包括一个全局PID算法用于合并所有子探测器信息实现带电粒子鉴别，以及一个基于量能器响应区分中性粒子的深度CNN算法。初步结果显示基于ML的PID算法取得了出色的粒子鉴别性能，极大地提升了STCF的物理潜力。
The shape phase transition for certain isotope or isotone chains, associated with the quantum phase transition of finite nuclei, is an intriguing phenomenon in nuclear physics. A notable case is the Xe isotope chain, where the structure transits from a $\gamma$-soft rotor to a spherical vibrator, with the second-order shape phase transition occurring in the vicinity of $^{128−130}$Xe. In this...
超级陶粲装置（STCF）是中国未来的正负电子对撞机，其质心能量范围为2-7 Gev，峰值亮度可达$0.5\times 10^{35} \mathrm{~cm}^{-2} \mathrm{~s}^{-1}...
为了充分利用高亮度大型强子对撞机为味物理带来的机遇，LHCb实验计划在2032年左右对整个探测器进行二期升级，以应对高事例堆积、高辐照剂量等极端运行环境带来的一系列挑战。在LHCb探测器二期升级中，电磁量能器PicoCal最靠近束流管区域计划采用基于高精度致密钨栅格和超快GAGG晶体的SPACAL技术，LHCb中国组正在主导相关技术的研发。本报告将重点介绍LHCb电磁量能器升级的整体设计，中国组在高性能闪烁晶体（GAGG晶体）的研制，高精度致密钨吸收体开发，原型机研制，以及相关的模拟、测试和束流实验等。
It is usually believed that physics in off-equilibrium state can be equivalently studied using equilibrium state with suitable metric perturbation. We point out it is not the case for spin polarization phenomena: the exisiting chiral kinetic theory in curved space fails to recover all the couplings between spin and hydrodynamic gradients [1]. We present a new form of chiral kinetic theory in...
The Super Tau-Charm Facility (STCF) is the next generation high luminosity $e^{+}e^{-}$ collider focusing on the tau-charm physics. STCF will achieve a luminosity of over $0.5\times10^{35} cm^{-2}s^{-1}$ at 4 GeV, resulting in a high event rate and a high beam background for the detector system. The background count rate of over 1 MHz per module places new demands on the electromagnetic...
非对心相对论重离子碰撞中产生的系统具有极强的涡旋结构，垂直于反应平面方向的轨道角动量可导致末态超子的整体极化(global polarization)，而沿着束流方向的集体流涡旋效应则导致超子的局域极化现象(local polarization)。超子的自旋极化效应作为探索强相互作用物质流体性质的新方法，目前已取得了丰富的实验测量和理论研究结果，同时也存在一些亟需解决的问题，如末态磁场的影响、整体极化的碰撞系统尺寸依赖性、低能区的局域极化性质等。
本次报告中，我们将介绍RHIC-STAR实验上BES-II能区金核-金核碰撞以及200 GeV...
随着塑闪光纤工艺和具备单光子探测能力的硅光电倍增器(Silicon photomultipliers, SiPM)的发展，基于SiPM 阵列读出的塑料闪烁光纤探测器在设计制造上的成本和复杂度降低，可实现多种尺寸和形状的制备，甚至能够提供与传统硅微条探测器相当的高位置分辨率，因而在空间和地面的粒子物理实验中具有广泛的应用前景。该报告将从探测器模拟、器件测试、模块制备以及读出电子学等方面，介绍大尺寸、高位置分辨的塑料闪烁光纤探测器设计原理和研究进展。
低温高密核物质测量谱仪，即兰州重离子加速器冷却储存环外靶实验（CSR External target Experiment，简称CEE），将是我国第一台运行于GeV 能区的完全自主研制的大型核物理实验装置。CEE实验通过对重离子碰撞产物的近全空间测量，对低温高密相区的核物质状态的结构和性质开展深入研究。在CEE谱仪下游方向的束流线附近设计零度角量能器（Zero-Degree Calorimeter，简称ZDC），测量前角区带电粒子在探测器中的沉积能量和位置分布，用于重建碰撞事件平面和确定事件中心度。ZDC可实现500...
STAR合作组在《自然》杂志上发表了他们对高能重离子碰撞中$\Lambda$超子整体极化和$\phi$，$K^{*0}$矢量介子整体自旋排列的实验结果[1,2]，不仅证实了夸克物质整体极化这一新现象[3,4]，使自旋极化的研究成为高能核物理前沿新方向，而且表明在相对论性重离子碰撞中，夸克和反夸克在反应平面法线方向上可能存在很强的自旋关联，从而使夸克自旋关联的研究成为当前该方向新的增长点。在文献[5]中，我们提出了一种系统性的方法来描述夸克物质中的这种关联，并将其分类为局域和长程夸克自旋关联。我们的研究表明有效的夸克自旋关联包括直接源于动力学过程的真正自旋关联，以及考虑其它自由度平均引起的诱导关联。我们还展示了如何通过测量矢量介子的自旋密度矩阵以及超子-超子和超子-反超子的自旋关联来研究这种关联，并阐明了这些可观测量与夸克和反夸克自旋关联之间的关系。本报告的目标是系统介绍[5]中关于夸...
We present a new derivation of relativistic second-order spin hydrodynamics for quantum systems using Zubarev’s non-equilibrium statistical-operator formalism. This is achieved by a systematic expansion of the energy-momentum tensor, the spin tensor and the charge current to second order in deviations from equilibrium. As a concrete example, we obtain the relaxation equations for the...
The Circular Electron Positron Collider (CEPC) is a proposed future high-energy lepton collider aimed at advancing our understanding of fundamental physics by exploring Higgs boson with unprecedented precision. A major challenge for the CEPC detectors is achieving a boson mass resolution (BMR) of 4%, which is required to separate the Higgs, Z, and W bosons in their hadronic decays. The...
Exploring the location of the critical end point (CEP) in the Quantum Chromodynamics (QCD) phase diagram is an important scientific problem that has remained unsolved for decades. Recent studies suggest that the CEP may exist within the QCD matter produced in the beam energy scan project of heavy ion collisions at $\sqrt{s_{NN}} = 3-7.7$ GeV. First-principle Lattice QCD calculations are...
超级τ-粲装置（STCF）是中国粒子物理学界提出的一种工作在2~7GeV质心能量下的电子-正电子对撞机。它将为探索τ-粲物理、奇特强子态和超出标准模型的物理提供一个平台。对于该装置，在整个动量范围内进行粒子鉴别（PID）是至关重要的。STCF的PID系统位于电磁量能器和主漂移室之间，并专注于高动量的带电强子，从约0.7GeV/c到2GeV/c。环形成像切伦科夫（RICH）探测器是可以在圆筒区域满足这些要求的技术之一。
本报告给出了PIDB RICH探测器的结构设计，研究了RICH探测器的预期性能。其将使用全氟己烷作为切伦科夫辐射体，碘化铯作为光阴极；并使Micro-Megas联合AGET电子学进行信号读出。通过Geant4模拟给出的结果显示该设计下RICH重建方法可以满足STCF对于强子PID的要求。此外，本报告还将介绍探测器原理样机的制作，性能测试及宇宙线实验的最新结果。
近年来，高能物理领域对味物理和Higgs物理探测需求不断提高，下一代环形高能正负电子对撞机加速器对撞亮度设计也不断提升。中国的CEPC和欧洲FCC-ee均作为高亮度Higgs粒子和Z粒子工厂，在Z峰值的对撞亮度已达到$10^{36}cm^{-2}s^{-1}$。时间投影室在正负电子对撞机实验的概念设计报告（CDR）、技术设计报告（TDR）中均作为基准主径迹探测。相对于传统大尺寸Pad型读出采用毫米级设计（如：$1\,mm\times6\,mm$），新发展的像素型时间投影室技术（Pixel...
新一代正负电子对撞机——超级陶粲装置（STCF）的设计对撞亮度大于 0.5×10$^{35}$cm$^{-2}$ s$^{-1}$，预期事例率达到 400kHz，新装置上强辐照和高计数率的实验条件对外径迹探测器主漂移室（MDCH）提出了严峻挑战。研究人员对MDCH系统进行了详细设计和优化，包括整体机械及应力分析，超小单元的技术攻关，电极丝的高密度排布和固定方法研究，新定位子及穿丝工艺验证、丝张力控制及丝张力测量研究，电子学信号仿真，读出电子学架构及探测器时间与电荷测量方法研究，为未来STCF中MDCH工程机的研制提供了技术基础。
基于一整个太阳周期（11年）的AMS数据，我们测量了宇宙线反质子流强随时间的变化，时间粒度27天，刚度范围1-41.9GV。
测量结果显示，宇宙线反质子流强具有独特的性质：反质子流强随着刚度增加先升后降，在大约3GV达到最大，而质子、电子、正电子的流强则是一直下降。反质子流强随时间变化的幅度明显比其他粒子要小。反质子和质子流强之间具有变化迟滞关系，而反质子与电子流强之间是线性关系。值得注意的是，在一个11年的太阳周期内，流强随时间变化幅度与流强的能谱形状有明显的相关性。
对于理解宇宙线反质子起源，以及理解太阳调制及其与粒子质量、电荷及能谱形状的关系，AMS的流强随时间的测量结果提供了至关重要的信息。
Interest in searches for Charged Lepton Flavor Violation (CLFV) has persisted over the past few decades, as the observation of CLFV would indicate new physics beyond the Standard Model (BSM). Several future high-luminosity lepton colliders have been proposed, which will enable CLFV searches to reach unprecedented precision. This work performs a detailed comparative study of CLFV searches at...
We propose here a set of new methods to directly detect light mass dark matter through its scattering with abundant atmospheric muons or accelerator beams. Firstly, we plan to use the free cosmic-ray muons interacting with dark matter in a volume surrounded by tracking detectors, to trace possible interaction between dark matter and muons. Secondly, we will interface our device with domestic...
With high duty cycle and wide aperture, the Large High Altitude Air Shower Observatory - Water Cherenkov Detector Array (LHAASO-WCDA) can conduct an unbiased gamma-ray sky survey in the energy range from a few hundred GeV to 100 TeV. The sensitivity of WCDA is as high as a few percent of Crab units, which allows us to monitor the VHE variability of blazars. The LHAASO Collaboration has...
A review of Higgs property measurement from ATLAS including both the di-Higgs and single Higgs measurement.
The Taishan Antineutrino Observatory (TAO or JUNO-TAO) is a satellite experiment of JUNO and located near the Taishan Nuclear Power Plant. TAO will measure the energy spectrum of reactor antineutrinos with unprecedented precision, which will benefit both of reactor neutrino experiments and nuclear database. A detector geometry and event visualization system is developed for TAO. The software...
宇宙线反氘是暗物质湮灭的潜在信号之一，其特征是具有很低的天体物理学背景。阿尔法磁谱仪(AMS)是目前唯一运行在太空中的磁谱仪，能够精确分辨宇宙线中的正反粒子，我们将报告使用AMS进行宇宙线反氘测量的最新进展。
宇宙线是极端天体物理过程的重要信使，宇宙线的起源、加速和传播是跨越世纪的重大科学问题。宇宙线中的锂原子核（Li）和铍原子核（Be）是初级宇宙线在银河系传播过程中碎裂产生的次级宇宙线，它们的流强包含着关于宇宙线起源和传播的重要信息。次级宇宙线和初级宇宙线的流强比可以用于测量宇宙线在银河系传播过程中穿越的物质量，Li和Be的同位素组分则可以为研究宇宙线传播过程提供重要的补充信息：$^7$Li/$^6$Li可用于检验初级Li宇宙线是否存在，放射性同位素$^{10}$Be可用于测量宇宙射线在银河系中的传播年龄。当前对$^6$Li/$^7$Li和$^{10}$Be/$^9$Be流强比的测量分别局限于低于1 GeV/n和2 GeV/n的能量，并且受到有限测量精度的限制。Li同位素以及Be同位素的流强则只在0.3 GeV/n和0.4...
Precision measurements by AMS reveal unique properties of cosmic charged elementary particles. In the absolute rigidity range ~60 to ~500 GV, the antiproton flux and proton flux have nearly identical rigidity dependence. This behavior indicates an excess of high energy antiprotons compared with secondary antiprotons produced from the collision of cosmic rays. More importantly, from ~60 to ~500...
本报告将介绍AMS实验关于宇宙线氘原子核流强和成分测量的最新结果。AMS实验基于收集的2100万宇宙线氘（D）原子核，精确测量了1.9 GV至21 GV刚度范围内的D流强。在整个刚度范围内，D与质子（p）、氦-3（He3）、氦-4（He4）的流强展现出几乎相同的时间变化关系。在4.5 GV以上，D/He4流强比不随时间变化，其刚度依赖性可以用指数为-0.108+/-0.005的单一幂律谱描述。这与He3/He4流强比的幂律谱指数（-0.289+/-0.003）显著不同。在13 GV以上，D与p具有相同的刚度依赖性，D/p流强比为常数0.027+/-0.001。这些现象意味着宇宙线氘核存在初级成分。通过一种模型无关的方式，我们得到初级D成分相当于（9.4+/-0.5）%的He4，次级D成分相当于（58+/-5）%的He3。
阿尔法磁谱仪（AMS）是安装在国际空间站上的大型精密磁谱仪实验，能够同时精确测量物质和反物质能谱。带电宇宙线进入日球层后因太阳调制而发生流强的改变，太阳活动则导致宇宙线流强随时间而变化。精确测量不同种类、不同能量的宇宙线粒子流强随时间的变化是认识宇宙线日球层传播过程，研究太阳调制效应的重要实验手段。本报告将介绍AMS实验宇宙线质子、反质子、氦核、电子、正电子流强时间结构测量的最新结果，展现宇宙线太阳调制与电荷符号等因素的相关性。
We describe the origin of the hierarchical SM quark/lepton Yukawa couplings with the single SM Higgs doublet in an SU(8) theory, where three-generational SM fermions are non-trivially embedded.
The pulsar timings are sensitive to both the nanohertz gravitational-wave background and the oscillation of ultralight dark matter. The Hellings-Downs angular correlation curve provides a criterion to search for stochastic gravitational-wave backgrounds at nanohertz via pulsar timing arrays. We study the angular correlation of the timing residuals induced by the spin-2 ultralight dark matter,...
Carbon and Oxygen are among the most abundant intermediate species in cosmic rays, which originate from the evolution of stars and their final explosive phases at the end of their life cycles. The DArk Matter Particle Explorer (DAMPE) boasts excellent charge resolution and energy resolution for these types of cosmic rays, ranging from a few tens of GeV to hundreds of TeV. Notably, DAMPE has...
弱相互作用大质量粒子（WIMPs）作为最著名的暗物质候选粒子之一，已有大量直接探测实验对其进行探测，目前对WIMPs的参数空间的排除区域几乎就要达到中微子地板。许多新的轻质量暗物质候选粒子如轴子类暗物质、暗光子暗物质、费米子暗物质近年来逐渐成为研究热点。这些轻质量暗物质候选粒子对直接探测实验的本底及能量阈值提出了更高的要求。
本报告将介绍目前CDEX实验组对轴子类暗物质、暗光子暗物质、费米子暗物质的探测结果。
CDEX合作组使用高纯锗半导体探测器在位于四川西昌的中国锦屏地下实验室（CJPL）开展暗物质探测和无中微子双贝塔衰变实验研究。本报告将总结CDEX-1和CDEX-10两个实验阶段的物理成果，并介绍目前正在建设的CDEX-50暗物质实验和CDEX-300ν无中微子双贝塔衰变实验，以及面向未来大型高纯锗阵列实验的一系列关键技术预研。
正在建设的CSR外靶实验（CEE）时间投影室（TPC）用于研究高密度核物质的设计和构建。CEE TPC是在CEE进行的实验研究中至关重要的探测器，将用于研究核物质的相结构和超饱和密度下的冷非对称核物质状态方程。TPC的设计旨在为带电粒子提供轨迹信息，包括三维位置、动量、电荷和能量损失。
TPC是高能和核物理实验中常用的探测器。它由一个充满气体或液体的敏感体积组成，粒子电离产生的电子可以在电场中漂移。通过观察电子到达读出平面的位置，可以确定电离位置的二维信息，而第三维信息（漂移长度）可以通过漂移时间计算得出。CEE TPC计划成为中国迄今为止最大的TPC，体积约为1立方米。
CEE...
Ref. https://arxiv.org/abs/2406.01656
A combination of searches for Higgs boson decaying into a visible photon and a massless dark photon (H→γγ$_{d}$) is presented using 139 fb$^{-1}$ of proton--proton collision data at a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard...
Some astronomical observations observed a few astronomical systems which seem hard to be explained by the standard cold dark matter scenario. For example very diffuse and extremely dark matter deficit systems are observed. Dark matter properties beyond CDM are studied to explain these systems, such as dark matter with large self-interaction, or very light wave dark matter scenarios.
无中微子双贝塔衰变实验探索中微子是否为马约拉纳费米子，对于轻子数守恒和中微子质量来源等重要物理目标有着独特的意义，因此成为现代粒子物理研究最重要的研究课题之一。CUORE是当前最灵敏的无中微子双贝塔衰变实验之一，CUPID实验在CUORE的基础上，采用$^{100}$Mo为探测目标，并同时读取光信号和热信号，从而大大降低来自于表面$\alpha$和环境$\gamma$的本底。CUPID-China合作组正在积极进行探测器的各项研发工作，并开展国际合作，希望能利用锦屏地下实验室世界领先的低本底条件，进行无中微子双贝塔衰变实验。本报告介绍合作组目前的研发进展以及未来的计划。
Millicharged particles can be created in the atmosphere when high energy cosmic rays collide with nuclei, resulting in potentially observable signals at neutrino detectors. We analyse the resulting single scatter and multiple scatter signals at SuperK and JUNO. Searches for low energy coincident signals at JUNO will be sensitive to MCPs with masses between 2 GeV and 10 GeV with milli-charges...
The Baryon Acoustic Oscillations (BAO) is a powerful large-scale structure probe that is used to constrain dark energy models, and is the main goal of the latest large cosmology survey, eBOSS and Dark Energy Spectroscopic Instrument (DESI). I will present DESI first-year Data Release (Y1) cosmological results with a particular focus on the measurement of BAO from Lyman-α forest. We measure...
The Jiangmen Underground Neutrino Observatory (JUNO), located in Southern China, is a multi-purpose neutrino experiment that consists of a 20-kton liquid scintillator detector. The primary goal of the experiment is to determine the neutrino mass ordering (NMO) and measure other neutrino oscillation parameters to sub-percent precision. Atmospheric neutrinos are sensitive to NMO via matter...
Extensive experimental evidence has confirmed significant discrepancies between the reactor fission isotope antineutrino spectra predicted by the Huber-Mueller model and the data observed in experiments, leading to the phenomenon known as the Reactor Antineutrino Anomaly (RAA). Therefore, accurately measuring the isotope antineutrino spectra is crucial to addressing the RAA issue. Based on the...
We propose a theory to systematically construct a complete set of on-shell effective operator bases involving massive particles with any spins. The amplitude bases involving massive fields can be factorized into two charged and neutral parts under the little groups of massive particles, respectively. The complete bases of these two parts can be constructed by the Young diagrams of Lorentz...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector currently under construction in an underground laboratory in Southern China. JUNO is designed to achieve a remarkable energy resolution of 3% at 1 MeV, a large detector volume, and exceptional background control. With these capabilities, JUNO will become a flagship experiment in the forthcoming...
We calculate the total cross-section and differential distribution of Higgs boson pair production and decay to $b\bar{b}\gamma\gamma$ at NLO in QCD
This talk will discuss a few recent results from diboson sector in the ATLAS experiment, focusing on novelty and impact of these results. Propects will also be breifly discussed.
The Event Horizon Telescope (EHT) has revolutionized our ability to study black holes by providing unprecedented spatial resolution and unveiling horizon-scale details. With advancements leading to the next-generation EHT, there is potential to probe even deeper into the black hole's dark region, especially the inner shadow characterized by low-intensity foreground emissions from the jet,...
Using antimatter cosmic rays to search for dark matter is an important approach in dark matter research. However, there is still debate over whether dark matter is needed to explain the antiproton energy spectrum observed by AMS-02. The main research challenges lie in the difficulty of determining the solar modulation of antiprotons and the uncertainties in proton-proton collision...
在JUNO实验的离线软件中，探测器ID和几何管理系统在确保对探测器数据进行准确和高效处理方面发挥着至关重要的作用。探测器ID为每个光电倍增管（PMT）提供唯一的编号，使得离线软件中的不同应用程序可以轻松引用和识别PMT，为数据分析和重建保驾护航。ID映射服务的开发将使不同ID系统，诸如（离线、数据采集、电子、调试等）之间产生关联，这促进实验各个组件之间的无缝集成和通信，并确保数据处理过程的一致性。在离线软件中，基于GDML的几何管理系统旨在准确和全面地描述探测器的几何结构和形状，其能够实现对探测器组件的高效数据处理、分析和可视化，以及确保实验数据的准确性和可靠性。
江门地下中微子实验（JUNO）是以测定中微子质量排序为首要科学目标的大科学装置。数据质量监控系统（DQM）用于监控采集数据过程正确、平稳运行，在高能物理实验的数据采集中起重要作用。JUNO的DQM系统从数据获取系统（DAQ）重建原始数据，生成直方图并使用部署在网页上的可视化工具显示探测器性能，以保证高质量的数据采集。
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for $0 \nu \beta \beta$ decay that has successfully reached the one-tonne mass scale. The detector, located at the LNGS in Italy, consists of an array of 988 $\mathrm{TeO}_{2}$ crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data run in...
The DArk Matter Particle Explorer (DAMPE) is a satellite-based cosmic ray and gamma ray detector. It has been operating smoothly in space since December 2015. The main scientific objectives of DAMPE are (1) indirect detection of possible dark matter signatures, (2) studying the origins, acceleration and propagation mechanisms of cosmic rays, and (3) gamma-ray physics. In this contribution, we...
We present a pragmatic approach to lower down the mass scale of right-handed neutrinos in leptogenesis by introducing a scalar decaying to right-handed neutrinos. The key point of our proposal is that the out-of-equilibrium decays of the scalar provide an additional source for right-handed neutrinos and hence the lepton asymmetry. This mechanism works well at low temperatures when the washout...
LHAASO is a large hybrid extensive air shower observatory started operation since 2021. A PeV photo with energy of 1.4PeV was reported by LHAASO at first. Recently a very large ultra-high energy gamma ray bubble with energy up to PeV was detected at Cygnus region. The emission is positionally correlated with the distribution of clouds, which strongly supports a hadronic origin scenario. In...
We compute low energy supernova constraints on new light particles.
The Higgs Boson plays a fundamental role in Standard Model, and the precise measurement of its mass and width is one of the most important tasks of particle physics experiments. The mass measurement benefits from the processes where Higgs Boson decays into four leptons and two photons due to their excellent mass resolution, while Higgs boson width is measured indirectly by combining the...
Iron nuclei are the most abundant heavy nuclei in cosmic rays beyond silicon, and they interact much more with the interstellar medium during propagation compared to lighter nuclei, promoting the significance of precision measurement of the cosmic ray spectrum of iron nuclei, which is crucial for understanding the origin, acceleration, and propagation mechanisms of heavy cosmic ray.
The...
Galactic diffuse gamma-ray emission (GDE) is produced by the galactic cosmic rays (CR) interacting with the interstellar medium (ISM) and radiation fields (ISRF). The GDE is a very important probe of CR propagation and interaction. Different from the measurements of CR particles in the local vicinity, the GDE enables a direct measurement of CR distribution in the Milky Way, and can thus...
DAMPE (DArk Matter Particle Explorer) is the first Chinese satellite-borne experiment searching for dark matter and exploring the origin of the cosmic rays. It has been taking data for more than 8 years since its successful launch in December 2015. Spectral measurements of secondary nuclei such as lithium, beryllium, and boron, are mainly produced by the fragmentation of heavier nuclei, such...
In Dayabay reactor neutrino experiment, muon will induced correlated background: Li9/He8, Fast-neutron and Muon-X background. This talk will report
1. How to estimate these backgroud
2. Background rate with full dataset in nH sample.
We thoroughly explore the cosmic gravitational focusing of cosmic neutrino fluid (CνF) by dark matter (DM) halo using both general relativity for a point source of gravitational potential and Boltzmann equations for continuous overdensities. Derived in the most general way for both relativistic and non-relativistic neutrinos, our results show that the effect has fourth power dependence on the...
The CP-violating phase ($\delta_{\rm CP}$) and the ordering of the neutrino mass states (MO) remain among several open questions surrounding PMNS matrix in neutrino oscillation. However, these issues can't be solved by a single experiment so far. Atmospheric neutrino data at Super-Kamiokande (Super-K) and accelerator neutrino data at T2K offer complementary sensitivity to these puzzles. The...
Neutrinoless double beta ($0\nu\beta\beta$) decay is the most promising way to determine whether neutrinos are Majorana particles. There are many experiments based on different isotopes searching for $0\nu\beta\beta$ decay. Combining the searches of $0\nu\beta\beta$ decay in multiple isotopes provides a possible method to distinguish operators and different models. The contributions to...
The brightest gamma-ray burst of all time, GRB 221009A, occurred within the field of view of LHAASO at a zenith angle of approximately 28 degrees. LHAASO collected over 65,000 very-high-energy (VHE) photons from the burst and detected the onset of the GRB afterglow process in the VHE band for the first time. The light curve exhibits four stages, consisting of two rises and two decays. The...
The gamma-ray source MGRO J1908+06 is esteemed as one of the primary Galactic sites for cosmic-ray acceleration, although its nature remains unrevealed. We report the detection of gammarays from this region spanning energies from 1.6 TeV to 1.3 PeV, with a spectrum exhibiting gradual steepening and yielding an index Γ = (2.51±0.01) + (0.28±0.02)×log10(E/20TeV) through log-parabola model...
The Jiangmen Underground Neutrino Observatory (JUNO) has been primarily designed to determine the neutrino mass ordering by measuring the energy spectrum of neutrinos from two nuclear power plants, utilizing its exceptional energy resolution. JUNO employs a 20 kton liquid scintillator as the target substance in the central detector, with tens of thousands of 20-inch PMTs applied to achieve...
WIMP是最热门的暗物质候选粒子之一，近年来国际上有多个大型深地探测实验致力于WIMP的直接探测，包括位于我国四川锦屏地下实验室的PandaX。PandaX-4T是基于吨量级的氙的两相型TPC探测器，其低阈值、低本底、大灵敏体积、高探测效率等特点，使之跻身于WIMP探测前列。本报告将介绍PandaX-4T实验在WIMP暗物质的搜寻中信号响应模型，讨论模型的构建以及应用。
This work presents a phenomenological study on the angle between the Standard and the Winner-Take-All (WTA) jet axes ($\Delta R$) in high-energy nuclear collisions. Our theoretical results calculated by the LBT model show that the $\Delta R$ distribution in Pb+Pb at $\sqrt{s}=5.02$ TeV is narrower than that in p+p, which agrees well with the recent ALICE measurements. The narrowing of $\Delta...
Photons are important particles in collider physics. They play a crucial role in Standard Model (SM) processes, Higgs decays, or any potential new interactions that beyond the Standard Model. Therefore, photon identification efficiency is indispensable for many interesting physical analyses in collider physics. This poster presents the electron extrapolation method for photon identification...
In this talk I will present our recent work on determination of Charge-Parity violation in neutrino oscillation and search for quantum entanglement in a Muon Collider.
Using GeV-scale muon beams produced from electron-positron collision, we have neutrino sources rich in flux that can be used for long-base line neutrino oscillation experiments such as DEUN, NOvA and T2K.
Up to 1000 pseudo...
The center-of-mass energy of Circular Electron
Positron Collider (CEPC) could be upgrade to 360 GeV level
(CEPC@360GeV) after its ten-year running at 240 GeV.
Besides SM precision measurements, CEPC@360GeV also
has good potential for BSM physics searches, which is a
good complementary for hadron colliders. This paper presents
the sensitivity study of direct stau and smuon pair...
The directed flow in asymmetric collisions, such as Cu+Au, offers a valuable window into understanding the energy deposition mechanisms in heavy ion collisions, yet this remains an open challenge. In this work, we delve into the directed flow of charged hadrons in Cu+Au collisions at a center-of-mass energy of $\sqrt{s_{NN}}=200$ GeV. We develop a refined three-dimensional (3D) TRENTo initial...
The last decade enters an era of precise measurements on cosmic rays. The space based AMS02, DAMPE and the ground based LHAASO, Auger all give very precise measurements of the cosmic rays spectra and its components. These precise data change our traditional picture of cosmic rays origin and propagation. We show the important implications on the problem of origin of cosmic rays.
The origins of Ultra-high-energy cosmic rays (UHECRs) remain mysterious. Nevertheless, the
observation of UHE neutrinos offers a pivotal means to uncover the distant sources of these most
energetic particles, as neutrinos can traverse the universe unimpeded, even beyond the Greisen-
Zatsepin-Kuzmin (GZK) horizon.
The Giant Radio Array for Neutrino Detection (GRAND) is a proposed...
The Forbush Decrease (FD) is a rapid decline in the observed intensity of galactic cosmic rays following intense solar activity, such as a coronal mass ejection (CME). This phenomenon occurs due to fast solar wind sweeping away cosmic rays propagating in the space near the Earth. The Dark Matter Particle Explorer (DAMPE) is a satellite-based cosmic ray experiment with high precision in...
Ref: https://arxiv.org/abs/2306.00641
Results from a wide range of searches targeting different experimental signatures with and without missing transverse momentum ($𝐸^{𝑚𝑖𝑠𝑠}_{𝑇}$) are used to constrain a Two-Higgs-Doublet Model (2HDM) with an additional pseudo-scalar mediating the interaction between ordinary and dark matter (2HDM+a). The analyses use up to 139 fb$^{−1}$ of proton-proton...
中微子与原子核的相干性弹性散射（CEvNS）是粒子物理标准模型下MeV量级中微子与物质的主要相互作用过程之一。利用CEvNS测量中微子，不仅是对传统中微子探测方法的有力补充，同时也使得中微子探测器的小型化成为可能。RECODE实验基于低阈值的点电极高纯锗探测器技术，在三门核电开展反应堆中微子相干性弹性散射过程测量。本报告将介绍RECODE高纯锗反应堆中微子CEvNS实验计划及最新进展。
RELICS实验将采用两相型液态氙时间投影室（LXeTPC），寻找由核反应堆发出的约MeV量级的中微子在氙原子核上的相干散射信号（CE$\nu$NS）。由于CE $\nu$NS信号会在液氙中产生keV甚至更低的能量沉积，因此需要在相关能量范围内进行能量标定。为实现这一目标，我们将利用 $^{137}$Cs， $^{60}$Co以及$^{83}Kr^{m}$源来标定探测器中的电子反冲事件，同时将利用 $^{241}$AmBe和D-D中子发生器来标定探测器的核反冲事件以及CE$\nu$NS信号。本报告将介绍基于GEANT4模拟，根据各标定源在探测器内响应的情况，初步给出RELICS实验的标定系统方案。
精确测量相干弹性中微子-核散射（CEνNS）截面对于理解中微子的性质和标准模型之外的新物理具有重要意义。在低本底暗物质探测实验具有突出表现的液氙时间投影室（LXeTPC）是探测CEνNS信号最有前景的技术之一。然而由于低能区的背景噪声，探测核反冲能量低于1keV的反应堆中微子CEνNS信号仍然具有挑战性。反应堆中微子液氙相干散射实验（RELICS）将利用LXeTPC来探测反应堆中的中微子引起的CEνNS信号，预期每年曝光量下在120-240PE的S2能区中获得4902.4个 CEνNS 事件以及1318.4 个背景信号。本次报告将对RELICS实验的总体规划，实验本底以及预期灵敏度进行介绍。
中微子-原子核相干弹性散射(CE$\nu$NS)为研究中微子性质和寻找超标准模型物理提供了一种独特的探测手段。RELICS实验利用液氙时间投影室(LXeTPC)探测核反应堆中微子与氙原子核之间的(CE$\nu$NS)过程，LXeTPC技术通过同时探测瞬发闪烁光(S1)和电离电子的正比闪烁光(S2)来测量粒子沉积能量。我们的研究主要集中在提高TPC内部漂移电场的均匀性，进而提高信号事件的三维位置重建精度；通过光模拟评估S1信号的光采集效率，优化底部PMT阵列的设计。在本报告中，我们将详细介绍RELICS TPC的漂移电场模拟和优化方法，以及S1光模拟和底部PMT阵列的优化工作。
The neutrino oscillation is described by six independent parameters: three mixing angles $\theta_{23}$, $\theta_{12}$, and $\theta_{13}$), two mass-squared splittings, and one CP-violating phase ($\delta_{\mathrm{cp}}$). As of 2010, only $\theta_{13}$ and $\delta_{\mathrm{cp}}$ remained unknown. However, a non-zero value of $\theta_{13}$ is crucial for exploring CP violation in the lepton...
The primordial neutrino asymmetries leave significant imprints on the evolution of the universe and can therefore be constrained by cosmological observations of Big Bang Nucleosynthesis (BBN), the Cosmic Microwave Background (CMB), and Large Scale Structure (LSS).
In this paper, we present a systematic study of the implications and corresponding constraints of the primordial neutrino...
Solar neutrinos can interact with liquid xenon (LXe) dark matter detectors through coherent elastic neutrino-nucleus scattering (CEvNS), producing signals similar to DM-nucleus interactions. Known as the 'neutrino fog,' this phenomenon significantly challenges direct dark matter detection efforts. The XENONnT detector, noted for its substantial exposure and low background, provides a prime...
The search for neutrinoless double-beta decay (NLDBD) provides insights to the Majorana or Dirac nature of neutrinos, as well as their mass. PandaX-4T experiment, located at the China Jinping Underground Laboratory, uses a dual-phase xenon time projection chamber with 3.7-tonne natural xenon (8.9% Xe-136 abundance) in the sensitive volume. In this talk, I will present the optimization of data...
Within the Standard Model, transverse single spin asymmetries in electron elastic scatterings arise only from multi-photon exchanges. Experiments at MIT-Bates, MAMI, JLab, where transversely polarized electron beams scatter off both hydrogen and nuclei targets, show surprising discrepancies from theoretical calculations based on unitary and optical theorem. Comparing with the unitary...
PandaX-4T experiment is a deep-underground dark matter direct search experiment that employs a dual-phase time projection chamber with a sensitive volume containing 3.7 tonnes of liquid xenon. Along with a series of exotic dark matter model tests, a blind analysis was applied to the full exposure of PandaX-4T recorded data. In this talk, I will discuss the latest dark matter search results of...
The PandaX-4T experiment employs a liquid xenon detector to probe rare signals from both dark matter and neutrinos. Based on the dataset from science runs, we perform search for the coherent elastic neutrino-nucleus scattering (CEvNS) signals induced by solar neutrinos from Boron-8 decays. In this talk, I will present the analysis strategy and latest progress of CEvNS searches using PandaX-4T data.
The secondary nuclides lithium, beryllium, and boron in cosmic rays are primarily produced through the fragmentation of primary nuclides such as carbon and oxygen with the interstellar medium. The spectral measurements of these secondary nuclides are crucial for understanding the propagation mechanisms of cosmic rays. With the high charge resolution and large geometric factor, DAMPE (Dark...
The minimal left-right symmetric model offers a natural solution to the origin of neutrino masses and the strong CP problem, and has drawn considerable theoretical and experimental attention. In this presentation, I will discuss recent progress in exploring sterile neutrinos within this model, specifically focusing on the mass range from MeV to TeV. This will include an examination of...
The study of neutrinos with energy greater than 10^14eV is of the important and challenging tasks in multi-messenger astrophysics. Detectors must operate in well shielded laboratories. An alternative is provided by observations of horizontal air showers (HAS) produced by neutrinos. With this technique the background of showers induced by cosmic rays is heavily reduced due to the large...
The next generation liquid xenon detector will have about ~50T liquid xenon, the new designed powerful cryogenics and purificaton will be introduced, the results of the prototype will be given.
Very Large Area gamma ray Space Telescope (VLAST) is the next generation of flagship space observatory, which has a high acceptance of up to 10 m ^ 2 · sr in the GeV - TeV range and strong detection capability in the MeV - GeV range. Its comprehensive performance is expected to be more than 10 times higher than that of the Fermi Large Area Telescope (Fermi-LAT). VLAST has four sub-detectors:...
The General Antiparticle Spectrometer (GAPS) is a balloon-borne experiment, firstly optimized to identify low-energy (≲ 0.25 GeV/n) cosmic antinuclei from dark matter annihilation or decay. With a novel detection approach that uses the uniquely characterized atomic X-rays and charged particles from the decay of exotic atoms, the GAPS program will deliver an unprecedented sensitivity to cosmic...
In high-energy physics experiments, visualization software is essential for tasks such as detector design, offline data processing, and enhancing physics analysis. Detailed detector geometries and architectures, formatted in GDML or ROOT, are integrated into platforms like Unity for three-dimensional modeling. In this study, focusing on the BESIII spectrometer, Unity is used to display BESIII...
$^{134}$Xe is a candidate isotope for neutrinoless double beta decay~($0\nu\beta\beta$) search. In addition, the two-neutrino case ($2\nu\beta\beta$) allowed by the standard model of particle physics has not yet been observed.With the 656-kg natural xenon in the fiducial volume of the PandaX-4T detector, which contains 10.4\% of $^{134}$Xe, and its initial 94.9-day exposure, we have...
DD4hep是一个通用的探测器描述工具包，已被推荐用于下一代高能物理实验中的离线软件开发。FBX是一种流行的3D建模文件格式，广泛应用于工业3D建模与可视化软件中。我们研究了一种新方法，能够自动将复杂的高能物理探测器描述从DD4hep格式自动转化为FBX格式的3D建模文件。该方法经测试可用于紧凑型直线对撞机CLIC、超级陶粲装置STCF、环形正负电子对撞机CEPC等多个未来实验中基于DD4hep的探测器描述。自动的DD4hep-FBX探测器转换接口为下一代高能物理实验中的应用开发提供了便利，如探测器设计、模拟、可视化、数据监控和科普宣传等。
中子嬗变掺杂锗NTD-Ge是通过中子辐照及相应的嬗变掺杂过程产生具有十分均匀掺杂分布的锗半导体，在极低温度下其电阻对温度变化十分灵敏，且具有信号读出相对简单、大动态范围等独特优势，广泛应用于低温晶体量热器的热传感器。我们在中国先进研究堆对一批10N 纯度的高纯锗进行了热中子辐照，经过放射性冷却之后，对NTD-Ge的热中子辐照剂量、中子辐照缺陷以及载流子浓度等关键特性进行了测量研究。探索制定了NTD-Ge热传感器的电极制备流程，涉及表面抛光、离子注入、真空镀膜等多种微纳加工工艺，并解决了NTD-Ge金属电极粘附性差的问题。利用搭建的NTD-Ge极低温测试系统，对制备的NTD-Ge热传感器的极低温电阻-温度性能进行了测量，得到最低~20 mK低温下NTD-Ge的R-T特性符合理论预期的优良结果。
近年来，AMS02实验发布了质子、氦核及氦核同位素的周期性能谱，这些数据显示出与太阳调制有关的时间结构。基于这些实验数据，我们采取了一种不依赖宇宙线星际能谱的方法，利用基准t1时刻的测量数据来预测任意t2时刻的宇宙线能谱。结合最小chi2方法，我们在力场近似及其他解析模型中，采用与磁刚度无关的调制参数ϕ，验证了传统模型在太阳活动极大期与观测数据产生较大偏差。进一步地，我们在不同磁刚度区间内估算出调制参数ϕ的最佳拟合值，探索了太阳调制模型的刚度依赖性。
通过对高能宇宙线在全天区分布的各项异性研究可以帮助我们理解宇宙线的起源、传播和加速过程。我们利用国际空间站上的阿尔法磁谱仪（Alpha Magnetic Spectrometer，AMS）实验所收集的宇宙线数据研究了16GeV-500GeV的宇宙线电子、正电子在银河坐标系中方向分布的各向异性。报告将展示AMS电子、正电子偶极各向异性的测量结果，并讨论该结果的物理意义。
伽马射线是探索宇宙极端天体物理的探针，是研究宇宙线的加速以及传播过程、探究宇宙线起源问题的重要信使。大面积地面粒子探测器阵列对甚高能及以上的伽马射线具有高灵敏度、大视场、高占空比等特点，能够高效观测伽马射线源。南天大视场伽马射线望远镜（SWGO）作为下一代伽马射线巡天实验项目，其建设地点拟选在南美洲。SWGO将与北半球的HAWC和LHAASO等设施形成互补，从而实现对全天的观测。SWGO高能量灵敏度、大视场等特点，将有助于对南天尤其是银心等高能天体区域的深入观测，从而推动对高能天体物理的研究。
大亚湾实验自2011年投入运行至2020年停止取数，积累了庞大的反应堆中微子样本。基于近点探测器采集的全数据集，即约470万个反贝塔衰变候选事例，大亚湾实验精确测量了反应堆中微子能谱。在此基础上，基于反应堆燃料演化信息，测量的总能谱被分解成235U与239Pu核素能谱。大亚湾对反应堆中微子能谱的测量达到世界领先精度。然而，包括大亚湾在内的现有反应堆中微子实验，其能量分辨率不足以测量可能的能谱精细结构。江门中微子实验的近点卫星实验——台山实验（JUNO-TAO）将以前所未有的能量分辨率，即2%@1MeV，高精度测量反应堆中微子能谱。从而，为江门实验提供有效约束精细结构的高精度能谱输入。JUNO-TAO探测器距离台山反应堆堆芯44m，将采用在低温（-50℃）条件下运行的掺钆液闪，与高覆盖率（94%）和高探测效率（50%）的硅光电倍增管阵列，预计2025年投入运行。
本报告将介绍大亚湾实...
Sub-MeV暗物质粒子被诸多理论模型选为暗物质的候选者，但受限于直接探测实验的阈值，使得热平衡态(速度~$10^{-3}c$)的本地sub-MeV暗物质粒子流难以在实验中被观测到。然而暗物质粒子可能会被高能的宇宙线粒子碰撞而获得更高的能量。此前，我们利用暗物质粒子与核子的散射机制，通过PandaX-II实验数据搜寻宇宙线加速Sub-GeV暗物质。考虑暗物质和电子的相互作用同样重要，我们利用PandaX-4T试运行实验数据寻找宇宙线电子加速轻质量暗物质，最终将质量范围在现有实验结果基础上向下扩展了两个数量级以上，并对尚未被探测的参数空间，即暗物质质量小于3 keV且低至10 eV的区间设定了新的约束，达到地球附近暗物质密度允许的最小费米子暗物质质量。
宇宙线的到达方向呈现微弱的各向异性分布，强度在万分之几到百分之几的量级。随着能量的增加，宇宙线的大尺度各向异性强度和分布形态呈现明显的变化。宇宙线各向异性的起因尚未明确，可能与宇宙线的传播、源的分布以及局部磁场扰动等有关。测量宇宙线的各向异性，特别是对高能宇宙线以及宇宙线成分的测量，对宇宙线的传播等理论提供重要依据。LHAASO海拔4410米，覆盖面积超过一平方公里，采用多种探测手段，具有很宽的能量测量范围和良好的粒子鉴别能力。LHAASO能够实现对高能宇宙线（PeV能量级）各向异性的精确测量，解决现有实验在高能区域测量精度有限的问题。能够实现对宇宙线轻、重成分的测量，填补目前对宇宙线成分各向异性实验观测的空白。
按SU(5)大统一模型[1]、[2]，对称性破缺方式是SU（5）→SU（3）×SU(2)×U(1)→U(1)。在强子内部有近似的SU(3)×U(1)定域对称性，强子作为非拓扑孤粒子存在；在强子中的夸克与胶子具有近似已知夸克与胶子的性质；在强子外部，夸克具有整数电荷，只有U(1)定域对称性。强子内部夸克与胶子的质量远小于强子外部夸克与胶子的质量，自由夸克与胶子能够存在，但将很快衰变为强子和轻子；轻子进入强子中的质量显著大于轻子在强子外部时的质量，因此轻子不能存在于强子内部。按本模型，没有夸克禁闭问题，自然地解释了宇宙中正反重子不对称现象，μ子磁矩反常（比标准模型预言的更大），Xe原子的电子受到的反常作用，B介子的反常衰变。最近超出标准模型的一个新实验是
Σ^+→p^++μ^-+μ^+, ...
初级宇宙射线进入大气会与大气分子相互作用产生介子。次级介子在传播过程中有相互竞争的两个过程，衰变为缪子和进一步发生相互作用。大气温度的降低引起的大气分子数密度的减少使得介子和大气分子相互作用的机会减少。有更多的介子衰变而来的缪子产生。因此，地下缪子通量和实验室上方的大气温度有正向的关联，这已被许多实验所观测到。大亚湾实验用两年统计量的数据测量了有效温度和缪子事例率的关联系数。随着大亚湾实验更多数据的获取，期待得到具有更低的统计误差的关联系数。伴随着得到更高水平统计量的数据，有效温度和缪子事例率之间非线性的关联关系被观察到。这一报告将报道大亚湾实验对这一测量的当前的状态。
LHAASO has found more than 40 UHE cosmic accelerators within the Milky Way, with the highest energy photon reaching 1.4 quadrillion electron-volts, the highest energy photon ever observed. Most of these sources are extended sources that require telescopes with higher angular resolution and sensitivity to observe and study their morphology. Therefore, we propose a new project: Large Array of...
测量宇宙线原子核能谱随时间的变化是研究太阳活动的关键手段。安装在国际空间站上的阿尔法磁谱仪（AMS）是一个大接受度，长周期观测（预计将覆盖两个太阳活动11年周期）的空间磁谱仪实验设备，能够以前所未有的精度对GeV至TeV能量区间内的宇宙线能谱进行测量。本报告将介绍基于AMS实验所测量的宇宙线锂、铍、硼、碳、氮、氧等原子核能谱在2011年5月至2023年11月期间（完整覆盖一个太阳活动周期）随时间的变化，同时讨论不同电荷的宇宙线受到太阳调制效应的差异。
正在我国进行建设的超级陶粲装置（STCF）中需要实现一种全新的、具有较好时间测量能力的电磁量能器（ECAL），以满足背景噪声抑制、中子-γ甄别等物理需求。对时间测量电子学的需求包括：不低于100-ps的分辨率、2-μs以上的动态范围以及可多通道集成。因此，我们提出了一种3级量化结构的时间数字转换器（TDC），其中粗量化由可达到较大动态范围的计数器实现；细量化则是基于一种改进的游标延迟环，利用两种延迟锁相环实现了亚门级延迟的高分辨率。所提出的游标延迟环采用了自动复位机制来实现连续事件的测量，还可利用滑动尺度测量原理显著提高其测量线性度。采用180-nm标准CMOS工艺实现了该TDC原型芯片，共集成了8个测量通道，在100-MHz参考时钟频率下可实现41.7-ps的分辨率和2.56-μs的动态范围。测试结果显示，该TDC的单射精度可达到46.0-ps，DNL不超过0.5-LSB，INL不...
在寻找无中微子双贝塔衰变($0\nu\beta\beta$)的实验中，大部分实验都在限定的RoI范围内使用计数法获取$0\nu\beta\beta$的半衰期灵敏度，也有诸如KamLAND-Zen等实验使用能谱拟合法来完成这一工作，而通过这两种方法获得的$0\nu\beta\beta$半衰期灵敏度存在差异。
本研究基于中国锦屏地下实验室（CJPL）内的本底条件，通过模拟确认了一差异的存在。模拟显示拟合法给出的半衰期灵敏度约为计数法的1.25倍，本研究讨论了这一差异可能的源头。这些结论可以为未来的$0\nu\beta\beta$实验选择数据分析方式提供选择依据。
为了提高LHC的物理研究潜力，LHC将升级为高亮度大型强子对撞机（HL-LHC），束流亮度的提高将使质子-质子碰撞的堆积度提高到约200。由于高亮度导致的辐射损伤，ATLAS探测器中内径迹探测器（ITk）的最内两层硅像素探测器将在积分亮度达到2000...
氯化锂水基液闪在作为新型中微子探测器探测介质方面显现出巨大潜力。其中Li-7核素与MeV尺度的太阳中微子发生高截面的带电电流相互作用，为太阳中微子谱的测量提供了可能性。研究团队制备并提纯了一种饱和氯化锂水基液闪，其含盐量为45.3%w/w，并对其光学特性和光产额进行了测量。结果表明，在光电倍增管的敏感波长范围内，该液闪几乎没有吸收。在430 nm波长处的衰减长度可达50米。此外，研究还在氯化锂水基液闪中加入了一种闪烁剂carbostyril-124，并验证了其兼容性和提高光产额的效果，从而促进了切伦科夫增强型富锂探测器的开发。针对这类水基液闪，研究团队还开发了一套重建算法。该算法能够在MeV尺度上重建带电粒子的方向、位置和能量，其中对于4...
江门中微子实验（JUNO）是目前正在建设中的多功能中微子实验。JUNO的中心探测器是一个装有2万吨液体闪烁体的有机玻璃球，其被浸泡在3.5万吨水切伦科夫探测器中。该试验配备有17612个20英寸光电倍增管和25600个3英寸光电倍增管，用于探测物理事例信号。JUNO预期的能量分辨率将达到3%/√E(MeV) ，创造前所未有的精度。其主要物理目标是确定中微子质量排序并实现振荡参数的精细测量，具有探测反应堆中微子，超新星中微子、太阳中微子、大气中微子、质子衰变等领域的潜力。本次报告将介绍JUNO实验在中微子天文学方向的研究，涵盖探测核子衰变，太阳中微子，超新星中微子爆发，弥散超新星中微子背景和地球中微子等方向的物理潜力。
江门中微子实验（JUNO）是一个地下深达700米的低本底多物理目标实验，旨在利用反应堆中微子源测量中微子的质量顺序，并实现更高精度的中微子振荡参数测量。同时，JUNO还具有探测超新星中微子、太阳中微子、大气中微子、质子衰变等领域的潜力。JUNO的中心探测器是一个装有2万吨液体闪烁体的有机玻璃球，被浸泡在3.5万吨水切伦科夫探测器中。探测器共装有20012个20英寸光电倍增管和25600个3英寸光电倍增管，用于探测物理事例信号。JUNO预期的能量分辨率将达到3%/√E(MeV)，创造前所未有的精度。此外，顶部径迹探测器由塑料闪烁体构成，安装在水池顶部，旨在抑制宇宙线引起的本底信号。JUNO探测器在设计和安装方面面临着巨大的技术挑战，目前正在紧张进行安装工作，预计于2024年底完成安装并开始数据采集。
南海中微子望远镜计划，即“海铃计划”，将在中国南海3500米深海建造高能中微子望远镜，通过捕捉天体及地球大气中核反应过程产生的高能（>100 GeV）中微子，开展探索极端宇宙，揭秘宇宙射线起源，寻找新物理规律。海铃望远镜阵列将以高性能光学混合舱为基础，在海底建设超过1000根串列的非均匀阵列，覆盖大约8立方千米的海水体积，建成后能够全天候、全时段连续工作20-30年。
海铃团队在2021年完成探路者项目，在中国南海选定海域完成选址，验证了所选海域洋流平缓、海水透光度好，适合建造大型的中微子望远镜，并发布了大阵列概念设计。
海铃一期正在开展中，计划于2026年在选定海域布放10根串列，组成小型阵列，预计能探测到大气中微子并完成全技术链条的验证。本报告将介绍海铃计划最新进展以及未来规划。
屏蔽结构设计是锦屏百吨中微子探测器设计过程中的重要一环，因为屏蔽结构设计能够使其在基坑空间限制下，增大有效探测体积，从而增加对物理信号——太阳中微子、无中微子双贝塔衰变——的曝光量。
在本报告中，我们估计本底的事例率和能谱，提出了一些屏蔽方案，用Geant4模拟评估它们的效用，并最终选择了其中一个。
在计算本底事例率时，我们分别考虑了直接放射性衰变本底和中子相关本底。放射性衰变本底由模拟计算；而中子相关本底又分为两类：U238自裂变附带中子和 (alpha, n) 过程产生的中子，它们被分别计算并累加。
锦屏百吨探测器将放置与较狭窄的空间中，我们的屏蔽计划致力于用不锈钢薄层屏蔽放射性衰变产生的 beta,...
阿尔法磁谱仪（AMS）安装在国际空间站上，自2011年5月运行以来，已收集了超过2360亿个宇宙线事例。目前AMS在GV至TV的刚度范围内，精确测量了质子（电荷Z=1）到硅（Si，Z=14）以及硫（S，Z=16）、铁（Fe，Z=26）等原子核的流强。本报告将介绍AMS关于初级、次级以及第三类宇宙线原子核能谱测量的最新结果，讨论这些原子核在GV至TV能量范围内的能谱特征与结构，以及AMS使用模型无关的方法所得到的宇宙线源的元素丰度。这些实验结果为研究宇宙线的起源提供了独特的实验数据。
高海拔天体辐射探测实验 (High Altitude Detection of Astronomical Radiation,...
费曼积分是高能物理精确理论预言的基本计算工具。传统高圈多外线费曼积分的解析计算非常困难。运用动量 twistor 变量和多对数函数字母表新搜索算法，我们在高圈多外线费曼积分解析计算领域取得了突破。我们将介绍维数正规化下双圈六点费曼积分的解析结果，该成果可用于 4 jets 产生过程的 NNLO 截面计算。这一发展也是迄今为止维数正规化下,含标度最多的双圈费曼积分解析结果。
针对LHAASO发现的河内众多的超高能伽马射线源，LHAASO团队提出了建设超大规模的高能水下中微子望远镜项目(HUNT)，以期探测相关源的高能中微子信号。目前，在探测器模拟，核心器件研发，样机试验，国际合作等各方面都有不少的工作进展。
