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ATLAS and CMS experiments at the Large Hadron Collider discover a Higgs-like new boson

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Frontiers in Biology 2012年第5期7卷 491-493页

作者： xinchou lou Division for Experimental Physics The Institute of High Energy of Physics Chinese Academy of Sciences Beijing 100049 China Department of Physics University of Texas at Dallas Richardson TX 75083-0688 USA

On July 4, 2012, with the full anticipation of physicists and the general public around the world, the ATLAS and CMS experiments working at the Large Hadron Collider （LHC） released their latest preliminary results in the search for the Higgs particle, in a joint seminar presented at the European Lab for Particle Physics （CERN） in Geneva, Switzerland. Both experiments announced the observation of a new boson with a mass in the range of 125-126 GeV. The new particle is consistent with the long-sought Higgs boson, although much research work remains to be done before a firm confirmation of the discovery of the Higgs boson can be made. The seminar speakers representing these experiments are their respec- tive spokespersons：

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Estimation of the radiation backgrounds in the CEPC vertex detector

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Radiation Detection Technology and Methods 2022年第2期6卷 170-178页

作者： Wei Xu Haoyu Shi Hongbo Zhu Ke Li Sha Bai xinchou lou Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics Zhejiang UniversityHangzhou 310058China Department of Physics University of WashingtonSeattleWA 98195USA

Background The Circular Electron-Positron Collider(CEPC)is aimed for precision measurements of the Higgs boson properties and the electroweak *** achievable precision will be largely dependent on the controlled level of radiation backgrounds,which requires an optimized design of the interaction region to assure the optimal performance of both the accelerator and the *** In this article,the latest results on the radiation backgrounds are reported based on the accelerator parameters and the detector design presented in the CEPC conceptual design *** For the different sources of radiation backgrounds,simulation steps consisting of generation,tracking,and detector simulation were *** backgrounds from the processes of synchrotron radiation,pair production,radiative Bhabha scattering,beam gas Bremsstrahlung scattering,and beam thermal photon scattering were considered for the accel-erator operating at the different centre-of-mass energies(HZ threshold,WW threshold,and Z pole).Possible mitigation methods of masks and/or collimators were introduced to suppress the radiation backgrounds,together with the careful opti-mization of the interaction region *** the improved tracking methods during simulation,the accuracy and reliability of the results were *** addition,the radiation backgrounds on the CEPC vertex detector were estimated,and the pair-production was found to be the most important *** In the worst case of operation at the Z pole,the vertex detector would have to withstand a total ionization dose of 5.6 Mrad per year and a non-ionization energy loss(shown in 1 MeV neutron equivalent)of 1.06×10^(13)n_(eq)/cm^(2)per year.

关键词： CEPC Interaction region Beam-induced background Vertex detector

Classify the Higgs decays with the PFN and ParticleNet at electron-positron colliders

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Chinese Physics C 2022年第11期46卷 45-52页

作者： Gang Li Libo Liao xinchou lou Peixun Shen Weimin Song Shudong Wang Zhaoling Zhang Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Wuzhou University 82 Fumin Third RoadWanxiu DistrictWuzhou 543002China College of Physics Jilin University2699 Qianjin StreetChangchun 130012China University of Chinese Academy of Sciences Beijing 100049China

Various Higgs factories are proposed to study the Higgs boson precisely and systematically in a modelindependent *** this study,the Particle Flow Network and ParticleNet techniques are used to classify the Higgs decays into multicategories,and the ultimate goal is to realize an"end-to-end"analysis.A Monte Carlo simulation study is performed to demonstrate the feasibility,and the performance looks rather *** result could be the basis of a"one-stop"analysis to measure all the branching fractions of the Higgs decays simultaneously.

关键词： the Higgs Boson event classification Particle Flow Network ParticleNet

Search for invisible decays of the Higgs boson produced at the CEPC

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Chinese Physics C 2020年第12期44卷 1-8页

作者： Yuhang Tan Xin Shi Ryuta Kiuchi Manqi Ruan Maoqiang Jing Dan Yu Kaili Zhang xinchou lou Xin Mo Gang Li Susmita Jyotishmati Institute of High Energy Physics Beijing 100049China School of Physical Sciences University of Chinese Academy of Science(UCAS)Beijing 100049China State Key Laboratory of Particle Detection and Electronics 19B Yuquan RoadShijingshan DistrictBeijing 100049China Department of Physics University of Texas at DallasTexas 75080-3021USA

The Circular Electron Positron Collider(CEPC),proposed as a future Higgs boson factory,will operate at a center-of-mass energy of 240 GeV and will accumulate 5.6 ab−1 of integrated luminosity in 7 *** this study,we estimate the upper limit of BR(H→inv)for three independent channels,including two leptonic channels and one hadronic channel,at the *** on the full simulation analysis,the upper limit of BR(H→inv)could reach 0.26%at the 95%confidence *** the Stand Model(SM),the Higgs boson can only decay invisibly via H→ZZ∗→νν¯νν¯,so any evidence of invisible Higgs decays that exceed BR(H→inv)of the SM will indicate a phenomenon that is beyond the SM(BSM).The invariant mass resolution of the visible hadronic decay system ZH(Z→qq,H→inv)is simulated,and the physics requirement at the CEPC detector for reaching this is given.

关键词： CEPC invisible Higgs decays upper limit bosonmass resolution

Expected measurement precision of the branching ratio of the Higgs boson decaying to the di-photon at the CEPC

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Chinese Physics C 2023年第4期47卷 26-40页

作者：郭方毅方亚泉李刚娄辛丑 Institute of High Energy Physics(IHEP) Chinese Academy of ScienceBeijing 100049China University of Chinese Academy of Science Beijing 100049China University of Texas at Dallas Richards75080-3021TXUSA

This paper presents the prospects of measuring σ(e^(+)e^(-)→ZH)× Br(H→γγ) in three Z decay channels Z→qq/μ^(+)μ^(-)/vv using the baseline detector with √s=240GeV at the Circular Electron Positron Collider(CEPC).Simulated Monte Carlo events were generated and scaled to an integrated luminosity of 5.6 ab^(-1) to mimic the *** results to 20 ab^(-1) are also *** expected statistical precision of these measurements after combining three channels of Z boson decay was 7.7%.With some preliminary estimation on the systematical uncertainties,the total precision is 7.9%.The performance of the CEPC electro-magnetic calorimeter(ECAL) was studied by smearing the photon energy resolution in simulated events in the e^(+)e^(-)→ZH→qqγγ *** the present ECAL design,the stochastic term in resolution plays the dominant role in the precision of Higgs measurements in the H→γγ *** impact of the resolution on the measured precision of σ(ZH)×Br(ZH→qqγγ) as well as the optimization of the ECAL constant and stochastic terms were studied for further detector design.

关键词： CEPC Higgs Di-photon

Precision Higgs physics at the CEPC

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Chinese Physics C 2019年第4期43卷 5-44页

作者： Fenfen An Yu Bai Chunhui Chen Xin Chen Zhenxing Chen Joao Guimaraes da Costa Zhenwei Cui Yaquan Fang Chengdong Fu Jun Gao Yanyan Gao Yuanning Gao Shaofeng Ge Jiayin Gu Fangyi Guo Jun Guo Tao Han Shuang Han Hongjian He Xianke He Xiaogang He Jifeng Hu Shih-Chieh Hsu Shan Jin Maoqiang Jing Susmita Jyotishmati Ryuta Kiuchi Chia-Ming Kuo Peizhu Lai Boyang Li Congqiao Li Gang Li Haifeng Li Liang Li Shu Li Tong Li Qiang Li Hao Liang Zhijun Liang Libo Liao Bo Liu Jianbei Liu Tao Liu Zhen Liu xinchou lou Lianliang Ma Bruce Mellado Xin Mo Mila Pandurovic Jianming Qian Zhuoni Qian Nikolaos Rompotis Manqi Ruan Alex Schuy Lianyou Shan Jingyuan Shi Xin Shi Shufang Su Dayong Wang Jin Wang Liantao Wang Yifang Wang Yuqian Wei Yue Xu Haijun Yang Ying Yang Weiming Yao Dan Yu Kaili Zhang Zhaoru Zhang Mingrui Zhao Xianghu Zhao Ning Zhou Institute of High Energy Physics Department of Physics and Astronomy Iowa State University Department of Physics Southeast University Department of Engineering Physics Physics Department Tsinghua University School of Physics Peking University University of Chinese Academy of Science (UCAS) Physical Science Laboratory Huairou National Comprehensive Science Center School of Physics and Astronomy Shanghai Jiao Tong University KLPPAC-MoE SKLPPC Department of Physics University of Liverpool Kavli IPMU (WPI) UTIAS The University of Tokyo Department of Physics University of California PRISMA Cluster of Excellence & Mainz Institute of Theoretical Physics Johannes Gutenberg-Universit?t Mainz Department of Modern Physics University of Science and Technology of China Department of Physics & Astronomy University of Pittsburgh Tsung-Dao Lee Institute Department of Physics National Taiwan University Department of Physics University of Washington Department of Physics Nanjing University School of Nuclear Science and Technology University of South China Department of Physics University of Texas at Dallas Department of Physics and Center for High Energy and High Field Physics National Central University Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University Department of Physics Hong Kong University of Science and Technology Theoretical Physics Department Fermi National Accelerator Laboratory Maryland Center for Fundamental Physics Department of Physics University of Maryland School of Physics and Institute for Collider Particle Physics University of the Witwatersrand iThemba LABS National Research Foundation Vinca Institute of Nuclear Sciences University of Belgrade Department of Physics University of Michigan Center for Theoretical Physics of the Universe Institute of Basic Science Department of Physics University of Arizona Department of Physics University of Chicago Lawrence Berkeley National Laboratory Chi

The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy *** Higgs boson will be the subject of extensive studies of the ongoing LHC *** the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs *** Circular Electron Positron Collider(CEPC)is one of such proposed Higgs *** CEPC is an e^+e^- circular collider proposed by and to be hosted in *** in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs *** this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.

关键词： CEPC Higgs bos on Higgs boson properties Higgs boson couplings Higgs factory effective field theory,EFT

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH University of Science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui University HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu University Institute of ScienceVaranasi Bandirma Onyedi Eylul University Bandirma Beihang University Beijing Beijing Computational Science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal University Beijing Brown University ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad University Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo University Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central China Normal University WuhanHubei Central South University ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan China academy of engineering physics MianyangSichuan China building materials academy Beijing China Center of Advanced Science and Technology Beijing China Institute of Atomic Energy Beijing China Jiliang University HangzhouZhejiang China Nuclear Instrument CO. LTDBeijing China University of Geosciences Beijing China University of Geosciences WuhanHubei China University of Mining and Technology XuzhouJiangsu China West Normal University NanchongSichuan Chongqing University Department of PhysicsChongqing Chulalongkorn University Bangkok City University of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell University IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu University DalianLiaoning Dalian University of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East China University Of Science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise