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On the seven-loop renormalization of Gross-Neveu model

Journal of High Energy physics 2025年第6期2025卷 1-25页

作者： Huang, Rijun Jin, Qingjun Li, Yi Nanjing Key Laboratory of Particle Physics and Astrophysics School of Physics and Technology Nanjing Normal University Nanjing P.R. China Graduate School of China Academy of Engineering Physics Beijing P.R. China

The presence of an infinite number of marginal four-fermion operators is a key characteristic of the two-dimensional Gross-Neveu model. In this study, we investigate the structure of UV divergences in this model, and by symmetry argument we found that the renormalizability only requires a subset of evanescent operators. We perform a 7-loop renormalization computation of beta function for the corresponding evanescent operator, and confirm its non-trivial contribution to UV divergences. By integrating infrared rearrangement, dimensional shifting, and large momentum expansion techniques, we systematically reduce the two-dimensional tensor integrals in the four-fermion correlation functions into four-dimensional scalar integrals. These scalar integrals are subsequently evaluated using the graphical function method, which marks the first application of the method to models with fermionic fields. Our result represents the first time that beta functions have been computed analytically beyond 5-loop in a model with spinning particles.

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Rapidity dependence of global polarization in heavy ion collisions

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Chinese physics C 2021年第1期45卷 226-238页

作者： Zuo-Tang Liang Jun Song Isaac Upsal Qun Wang Zhangbu Xu Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation(MOE)Shandong UniversityQingdao 266237China Department of Physics Jining UniversityShandong 273155China Physics Department Brookhaven National LaboratoryUptonNew York 11973USA Department of Modem Physics University of Science and Technology of ChinaHefei 230026China

We use a geometric model for hadron polarization in heavy ion collisions with an emphasis on the rapidity *** model is based on the model of Brodsky,Gunion,and Kuhn,as well as the Bjorken scaling *** make predictions regarding the rapidity dependence of global Λ polarization in the collision energy range of 7.7-200 GeV by assuming the rapidity dependence of two parameters,κ and <ρτ>. The predictions can be tested by future beam-energy-scan experiments at the Relativistic Heavy Ion Collider of Brookhaven National Lab.

关键词： polarization orbital angular momentum relativistic heavy-ion collisions

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Dosimetry study of high repetition rate MeV electron beam from a continuous-wave photocathode gun

arXiv

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arXiv 2024年

作者： Sun, Jianhan Lv, Jianfeng Tian, Shang Liu, Juntao Zhang, Zihao Xu, Hang Lin, Lin Huang, Senlin State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion Physics School of Physics Peking University Beijing100871 China Beijing Laser Acceleration Innovation Center Beijing101407 China

DC-SRF-II gun, a high-brightness continuous-wave photocathode gun, has greater potential in electron beam irradiation applications. This paper presents the in-vacuum and in-air irradiation dosimetry study of the high repetition rate electron beam from the DC-SRF-II gun with both Monte Carlo simulations and experiments. Especially, high-dose uniform irradiations with flexible and accurate tuning of dose rate across orders of magnitude are demonstrated. Good stability and repeatability of the doses are also shown. The ultra-wide tuning range and precise control of irradiation time and dose rate are expected to pave the way for innovative applications across a wide range of fields. Copyright © 2024, The Authors. All rights reserved.

关键词： Dosimetry

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Preliminary investigations of a potential optics system for wideband X-ray telescopes

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Astronomical Techniques and Instruments 2024年第6期1卷 335-344页

作者： Liqiang Qi Tianxiang Chen Zhengwei Li Qianqing Yin Congzhan Liu Weichun Jiang Lin Li Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

We present preliminary investigations of a potential optics system for wideband X-ray *** optical design adopts the conical approximation of the Wolter-I configuration and a combination of multilayer coatings and silicon pore *** total number of mirror modules is 79,distributed in 8 rows with the radii at the intersection plane between 250 mm and 500 *** optimization of the total effective area using the figure of merits method suggests that the focal length is 30 m and the mirror coating is a combination of the W/Si and Pt/C *** fulfills the on-axis effective area requirements of 2000 cm^(2) at 10 keV and 300 cm^(2) at 60 keV and provides a broad energy response between 3 keV and 78.4 *** the current geometry and coating compositions,we implement a mass modeling of the telescope in Geant4 to predict mirror performances via the ray-tracing algorithm,including the angular resolution and effective *** the presumed metrological data as input,this can provide precision and finishing requirements for the manufacture of *** work demonstrates the feasibility of combining multilayer coatings and silicon pore optics for potential use in wideband X-ray telescopes and advances the development and progress of such missions.

关键词： Depth-graded multilayer Silicon pore optics Wideband X-ray telescope High-energy astrophysics

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Study of background from accidental coincidence signals in the PandaX-Ⅱexperiment

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Chinese physics C 2022年第10期46卷 11-24页

作者： Abdusalam Abdukerim Wei Chen Xun Chen Yunhua Chen Chen Cheng Xiangyi Cui Yingjie Fan Deqing Fang Changbo Fu Mengting Fu Lisheng Geng Karl Giboni Linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang Xiangdong Ji Yonglin Ju Shuaijie Li Huaxuan Liu Jianglai Liu Wenbo Ma Yugang Ma Yajun Mao Yue Meng Kaixiang Ni Jinhua Ning Xuyang Ning Xiangxiang Ren Changsong Shang Lin Si Guofang Shen Andi Tan Anqing Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai Xia Mengjiao Xiao Pengwei Xie Binbin Yan Jijun Yang Yong Yang Chunxu Yu Jumin Yuan Ying Yuan Xinning Zeng Dan Zhang Tao Zhang Li Zhao Qibin Zheng Jifang Zhou Ning Zhou Xiaopeng Zhou School of Physics and Astronomy Shanghai Jiao Tong UniversityMOE Key Laboratory for Particle Astrophysics and CosmologyShanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Tsung-Dao Lee Institute Shanghai 200240China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Peking UniversityBeijing 100871China School of Physics Beihang UniversityBeijing 102206China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing102206China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics University of MarylandCollege ParkMaryland 20742USA School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE) Shandong UniversityJinan 250100China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Center for High Energy Physics Peking UniversityBeijing 100871China

Ⅰ.INTRODUCTION The direct detection of dark matter particles,especially the weakly interacting massive particles(WIMPs),is being actively carried out by a couple of experiments worldwide[1].In recent years,the PandaX-Ⅱ experiment located in the China Jinping Underground laboratory(CJPL)[1-3],which uses the technology of dual phase liquid xenon time projection chambers(TPCs),has pushed the limits of the cross section between WIMPs and nucleons to a new level for most of the possible WIMP masses;other experiments of the same type are also being performed[4–10].

关键词： dark matter xenon detector background accidental coincidence machine learning

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Design of A High Performance Time-to-Digital Converter with Zero Dead Time on Xilinx FPGA

Design of A High Performance Time-to-Digital Converter with ...

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IEEE Instrumentation and Measurement technology Conference

作者： Xinren Qi Yonggang Wang Department of Modern Physics State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

Nowadays the time-to-digital converters (TDCs) implemented on field programmable gate array (FPGA) can achieve reasonably high measurement resolution and precision. However, some applications also require TDCs without measurement dead time to avoid event missing. In this paper, we propose a new TDC design method that can achieve high measurement precision while achieving zero measurement dead time as well. Using the traditional structure of tapped delay line (TDL) based TDC, the proposed TDC allows consecutive trigger signals flowing into the TDL and makes the encoder capable of capturing all trigger edges with the output of their timestamps. Since there is the inherent “bubble” problem in TDL for high performance implementation, the latched TDL status is first decomposed into sixteen divisions. The trigger edges on the divisions are identified parallel, and then all the trigger signals on the TDL have to be reinstalled to obtain their precise arrival times. The TDC has been implemented on a Xilinx Zynq Ultrascale+ FPGA for performance evaluation. The test results show that the TDC can achieve a resolution of 1.92 ps and a root mean square (RMS) precision better than 3.3 ps. By measuring two trigger signals located within one TDC sampling clock cycle, the TDC can measure them correctly, which means the proposed design method is effective for realizing zero measurement dead time.

关键词： Performance evaluation Pulse measurements Design methodology Logic gates Signal generators Instrumentation and measurement Root mean square

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Novel high-frequency gravitational waves detection with split cavity

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Physical Review D 2024年第8期109卷 084004-084004页

作者： Chu-Tian Gao Yu Gao Yiming Liu Sichun Sun School of Physics Beijing Institute of Technology Beijing 100081 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Gravitational waves can generate electromagnetic effects inside a strong electric or magnetic field within the Standard Model and general relativity. Here we propose using a quarterly split cavity and LC (inductor and capacitor) resonance circuit to detect a high-frequency gravitational wave from 0.1 MHz to GHz. We perform a full 3D simulation of the cavity’s signal for sensitivity estimate. Our sensitivity depends on the coherence timescale of the high-frequency gravitational wave sources and the volume size of the split cavity. We discuss the resonant measurement schemes for narrow-band gravitational wave sources and also a nonresonance scheme for broadband signals. For a meter-sized split cavity under a 14 Tesla magnetic field, the LC resonance enhanced sensitivity to the gravitational wave strain is expected to reach h∼10−20 around 10 MHz.

关键词： Axions Gravitational wave detection Gravitational waves Dark matter detectors

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General heavy-flavor mass scheme for charged-current DIS at NNLO and beyond

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Physical Review D 2022年第1期105卷 L011503-L011503页

作者： Jun Gao T. J. Hobbs P. M. Nadolsky ChuanLe Sun C.-P. Yuan INPAC Shanghai Key Laboratory for Particle Physics and Cosmology & School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory for Particle Astrophysics and Cosmology (MOE) Shanghai 200240 China Center for High Energy Physics Peking University Beijing 100871 China Fermi National Accelerator Laboratory Batavia Illinois 60510 USA Department of Physics Illinois Institute of Technology Chicago Illinois 60616 USA Department of Physics Southern Methodist University Dallas Texas 75275-0175 USA Jefferson Lab EIC Center Newport News Virginia 23606 USA Department of Physics and Astronomy Michigan State University East Lansing Michigan 48824 USA

Incompleteness in current knowledge of neutrino interactions with nuclear matter imposes a primary limitation in searches for leptonic CP violation carried out at long-baseline neutrino experiments. In this paper, we present a new computation that elevates the theoretical accuracy to next-to-next-to-leading order in QCD for charged-current deeply inelastic scattering processes relevant for ongoing and future neutrino programs. Mass-dependent quark contributions are consistently included across a wide range of momentum transfers in the simplified-ACOT-χ general-mass scheme. When appropriate, we further include next-to-next-to-next-to-leading order corrections in the zero-mass scheme. We show theoretical predictions for several experiments with neutrinos over a wide range of energies and at the upcoming electron-ion collider. Our prediction reduces perturbative uncertainties to ∼1%, sufficient for the high-precision objectives of future charged-current deeply inelastic scattering measurements, and provides important theoretical inputs to experimental studies of leptonic mixing and CP violations.

关键词： Deep inelastic scattering Nucleus-neutrino interactions Perturbative QCD Charm quark Neutrinos

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Detector development at the Back-n white neutron source

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Radiation Detection technology and Methods 2023年第2期7卷 171-191页

作者： Fan Ruirui Li Qiang Bao Jie Li Yang Liu Rong Jiang Wei Ren Jie Zhang Qiwei Cao Ping Gu Minhao Ren Zhizhou Yi Han Tang Jingyu An Qi Bai Haofan Bai Jiangbo Chen Qiping Chen Yonghao Chen Zhen Cui Zengqi Fan Anchuan Feng Changqing Feng Fanzhen Gao Keqing Han Changcai Han Zijie He Guozhu He Yongcheng Hong Yang Hu Yiwei Huang Hanxiong Jia Weihua Jiang Haoyu Jiang Zhijie Jin Zhengyao Kang Ling Li Bo Li Chao Li Gong Li Jiawen Li Xiao Liu Jie Liu Shubin Luan Guangyuan Ning Changjun Qi Binbin Ruan Xichao Song Zhaohui Sun Kang Tan Zhixin Tang Shengda Wang Pengcheng Wang Zhaohui Wen Zhongwei Wu Xiaoguang Wu Xuan Xie Likun Yang Yiwei Yu Yongji Zhang Guohui Zhang Linhao Zhang Mohan Zhang Xianpeng Zhang Yuliang Zhang Yue Zhang Zhiyong Zhao Maoyuan Zhou Luping Zhou Zhihao Zhu Kejun The CSNS Back-n Collaboration Institute of High Energy Physics CASBeijing 100049People’s Republic of China Spallation Neutron Source Science Center Dongguan 523803People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049People’s Republic of China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413People’s Republic of China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900People’s Republic of China Department of Modern Physics University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Particle Detection and Electronics Hefei 230026People’s Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026People’s Republic of China Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China 不详

Purpose Back-n is a white neutron beamline at China spallation neutron source,which was established in the year of *** is a powerful facility for nuclear data measurement,neutron detector calibration,and radiation effect *** A series of detectors were built for different experiments,including beam monitoring,beam profile measurement,neutron induced secondaries(fission fragments,light charged particles and gamma)cross section measurement,and neutron resonance radiography,etc.A common digitization electronics and a cluster-based DAQ were developed for these detector *** detectors have been employed at Back-n and serviced for experiments from the beginning of the beamline *** and conclusion As an overview of detectors of Back-n,the details of the detector design and the experiment performing are described in this *** developing systems,e.g.,MTPC and B-MCP,are also included.

关键词： White neutron source Beam diagnostics Fission fragment Charged particle Gamma Neutron resonance radiography

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The missing base molecules in atmospheric acid-base nucleation

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National Science Review 2022年第10期9卷 196-208页

作者： Runlong Cai Rujing Yin Chao Yan Dongsen Yang Chenjuan Deng Lubna Dada Juha Kangasluoma Jenni Kontkanen Roope Halonen Yan Ma Xiuhui Zhang Pauli Paasonen Tuukka Pet?j? Veli-Matti Kerminen Yongchun Liu Federico Bianchi Jun Zheng Lin Wang Jiming Hao James N.Smith Neil M. Donahue Markku Kulmala Douglas R.Worsnop Jingkun Jiang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Institute for Atmospheric and Earth System Research/Physics Faculty of Science University of Helsinki Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Laboratory of Atmospheric Chemistry Paul Scherrer Institute Center for Joint Quantum Studies and Department of Physics School of Science Tianjin University Key Laboratory of Cluster Science Ministry of Education of China School of Chemistry and Chemical Engineering Beijing Institute of Technology Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) Department of Environmental Science and Engineering Fudan University Chemistry Department University of California Center for Atmospheric Particle Studies Carnegie Mellon University Department of Chemistry Carnegie Mellon University Aerodyne Research Inc.

Transformation of low-volatility gaseous precursors to new particles affects aerosol number concentration,cloud formation and hence the *** clustering of acid and base molecules is a major mechanism driving fast nucleation and initial growth of new particles in the ***,the acid-base cluster composition,measured using state-of-the-art mass spectrometers,cannot explain the measured high formation rate of new *** we present strong evidence for the existence of base molecules such as amines in the smallest atmospheric sulfuric acid clusters prior to their detection by mass *** demonstrate that forming（H2SO4）1（amine）1is the rate-limiting step in atmospheric H2SO4-amine nucleation and the uptake of（H2SO4）1（amine）1is a major pathway for the initial growth of *** proposed mechanism is very consistent with measured new particle formation in urban Beijing,in which dimethylamine is the key base for H2SO4nucleation while other bases such as ammonia may contribute to the growth of larger *** findings further underline the fact that strong amines,even at low concentrations and when undetected in the smallest clusters,can be crucial to particle formation in the planetary boundary layer.

关键词： new particle formation acid-base nucleation aerosol polluted urban environment

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