Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik, Wien, Austria.
Phys Rev Lett. 2018 Sep 21;121(12):121801. doi: 10.1103/PhysRevLett.121.121801.
The observation of the standard model (SM) Higgs boson decay to a pair of bottom quarks is presented. The main contribution to this result is from processes in which Higgs bosons are produced in association with a W or Z boson (VH), and are searched for in final states including 0, 1, or 2 charged leptons and two identified bottom quark jets. The results from the measurement of these processes in a data sample recorded by the CMS experiment in 2017, comprising 41.3 fb^{-1} of proton-proton collisions at sqrt[s]=13 TeV, are described. When combined with previous VH measurements using data collected at sqrt[s]=7, 8, and 13 TeV, an excess of events is observed at m_{H}=125 GeV with a significance of 4.8 standard deviations, where the expectation for the SM Higgs boson is 4.9. The corresponding measured signal strength is 1.01±0.22. The combination of this result with searches by the CMS experiment for H→bb[over ¯] in other production processes yields an observed (expected) significance of 5.6 (5.5) standard deviations and a signal strength of 1.04±0.20.
呈现了对标准模型 (SM) 希格斯玻色子衰变为一对底夸克的观测结果。该结果的主要贡献来自于希格斯玻色子与 W 或 Z 玻色子 (VH) 联合产生的过程，并在包括 0、1 或 2 个带电轻子和两个识别出的底夸克喷注的末态中进行搜索。描述了 CMS 实验在 2017 年记录的质子-质子碰撞数据样本中对这些过程进行的测量结果，该样本包含 41.3 fb^{-1}在 sqrt[s]=13 TeV 的数据。当与使用 sqrt[s]=7、8 和 13 TeV 收集的数据进行的之前的 VH 测量结果相结合时，在 m_{H}=125 GeV 处观察到事件过量，置信度为 4.8 个标准差，其中 SM 希格斯玻色子的预期值为 4.9。对应的测量信号强度为 1.01±0.22。该结果与 CMS 实验对其他产生过程中 H→bb[over ¯]的搜索结果相结合，得到了观察到的（预期的）5.6（5.5）个标准差的置信度和 1.04±0.20 的信号强度。
