检索结果-南通市图书馆

Estimation of the radiation backgrounds in the CEPC vertex detector

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 parameters.The 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 detectors.Purpose 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 reports.Method For the different sources of radiation backgrounds,simulation steps consisting of generation,tracking,and detector simulation were performed.Radiation 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 design.With the improved tracking methods during simulation,the accuracy and reliability of the results were improved.In addition,the radiation backgrounds on the CEPC vertex detector were estimated,and the pair-production was found to be the most important source.Result 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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：

关键词：

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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 data.Extrapolated results to 20 ab^(-1) are also reported.The 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 channel.In the present ECAL design,the stochastic term in resolution plays the dominant role in the precision of Higgs measurements in the H→γγ channel.The 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

Chinese Physics C 2022年第11期46卷 45-52页

作者：李刚廖立波娄辛丑沈培迅宋维民王书栋张兆领 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 way.In 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 promising.This 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

Chinese Physics C 2020年第12期44卷 1-8页

作者：谭雨航史欣 Ryuta Kiuchi 阮曼奇荆茂强于丹张凯栗娄辛丑莫欣李刚 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 years.In 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 CEPC.Based on the full simulation analysis,the upper limit of BR(H→inv)could reach 0.26%at the 95%confidence level.In 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Precision Higgs physics at the CEPC

引用

Chinese Physics C 2019年第4期43卷 5-44页

作者：安芬芬白羽陈春晖陈新陈振兴 Joao Guimaraes da Costa 崔振崴方亚泉付成栋高俊高艳彦高原宁葛韶锋顾嘉荫郭方毅郭军韩涛韩爽何红建何显柯何小刚胡继峰徐士杰金山荆茂强 Susmita Jyotishmati Ryuta Kiuchi 郭家铭赖培筑李博扬李聪乔李刚李海峰李亮李数李通李强梁浩梁志均廖立波刘波刘建北刘涛刘真娄辛丑马连良 Bruce Mellado 莫欣 Mila Pandurovic 钱剑明钱卓妮 Nikolaos Rompotis 阮曼奇 Alex Schuy 单连友史静远史欣苏淑芳王大勇王锦王连涛王贻芳魏彧骞许悦杨海军杨迎姚为民于丹张凯栗张照茹赵明锐赵祥虎周宁 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 physics.The Higgs boson will be the subject of extensive studies of the ongoing LHC program.At 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 boson.The Circular Electron Positron Collider(CEPC)is one of such proposed Higgs factories.The CEPC is an e^+e^- circular collider proposed by and to be hosted in China.Located in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs factory.In 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：