Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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DOI：
10.1016/j.physletb.2012.08.021
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发表时间：
2012-09-17
影响因子：
4.4
通讯作者：
Wenman, D.
中科院分区：
文献类型：
--
作者：
Chatrchyan, S.;Khachatryan, V.;Wenman, D.
结果是从搜索标准模型希格斯玻色子在质子-质子碰撞在根s = 7和8 TeV的紧凑μ子螺线管实验在大型强子对撞机，使用的数据样本对应的积分亮度高达5.1 fb（-1）在7 TeV和5.3 fb（-1）在8 TeV。搜索以五种衰减模式执行：gamma gamma、ZZ、W+W-、tau（+）tau（-）和B（B）over bar。在预期的背景之上观察到过量的事件，在质量接近125 GeV时，局部显著性为5.0标准差，这表明产生了新粒子。对于标准模型中的希格斯玻色子，该质量的预期显著性为5.8个标准差。过量在具有最佳质量分辨率的两种衰变模式中最为显著，伽马伽马和ZZ;对这些信号的拟合给出了125.3 +/- 0.4（统计）的质量。+/- 0.5（系统）GeV。衰变为两个光子表明新粒子是一种自旋不同于一的玻色子。(C)2012年欧洲核子研究中心。Elsevier B. V.出版，保留所有权利。
Results are presented from searches for the standard model Higgs boson in proton-proton collisions at root s = 7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 fb(-1) at 7 TeV and 5.3 fb(-1) at 8 TeV. The search is performed in five decay modes: gamma gamma, ZZ, W+W-, tau(+)tau(-), and b (b) over bar. An excess of events is observed above the expected background, with a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, gamma gamma and ZZ; a fit to these signals gives a mass of 125.3 +/- 0.4(stat.) +/- 0.5(syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.