Evidence for the H-->bb decay with the ATLAS detector
Evidence for the H-->bb decay with the ATLAS detector
复制标题
ATLAS 探测器的 H-->bb 衰变证据
DOI：
10.1007/jhep12(2017)024
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发表时间：
2017
影响因子：
5.4
通讯作者：
the ATLAS collaboration
中科院分区：
文献类型：
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作者：
the ATLAS collaboration
当标准模型希格斯玻色子与W玻色子或Z玻色子联合产生时，人们用ATLAS探测器寻找希格斯玻色子衰变成bb ′对的过程。分析的数据，对应于36.1 fb−1的积分光度，是在大型强子对撞机运行2的质子-质子碰撞中收集的，质心能量为13 TeV。考虑了包含零个、一个和两个带电轻子（电子或μ子）的末态，目标是衰变Z → νν、W → ν ν和Z → ν ν。对于一个质量为125 GeV的希格斯玻色子，超过其他标准模型过程的预期背景的事件被发现有3.5个标准差的观测显著性，而预期为3.0个标准差。这种过剩为希格斯玻色子衰变为b夸克以及它的产生与矢量玻色子有关提供了证据。将该结果与运行1分析的结果相结合，得出测量信号事件与标准模型预期值的比值等于0.90 ± 0.18（统计学）。− 0.19+ 0.21（系统）。假设标准模型的产生截面，结果与标准模型中汤川耦合到b夸克的值是一致的。
A search for the decay of the Standard Model Higgs boson into a bb¯ pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb−1, were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ℓν and Z → ℓℓ. For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0.90 ± 0.18(stat.)− 0.19+ 0.21(syst.). Assuming the Standard Model production cross-section, the results are consistent with the value of the Yukawa coupling to b-quarks in the Standard Model.