arXiv 1612.016562016-12-06hep-ex

ATLAS SM VH（bb）运行2检索

ATLAS SM VH(bb) Run-2 Search

Adrian Buzatu

备注：: 4 pages, 4 figures, Proceedings for the 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, http://cds.cern.ch/record/2231600

摘要：

2012年在大型强子对撞机上发现的希格斯玻色子被观察到直接与$W$和$Z$玻色子以及$τ$轻子耦合，并间接与顶夸克耦合。为了探测它是否真的是标准模型预测的粒子，还必须测量希格斯玻色子与夸克的直接耦合。希格斯玻色子最常衰变为一对底夸克（分支比为58%）。当希格斯玻色子在胶子-胶子融合中单独产生时，这种衰变模式下的信号被规则的多喷流背景淹没。通过要求希格斯玻色子与矢量玻色子$V$（$W$或$Z$）相关联地产生，还要求矢量玻色子$V$以轻子方式衰变，可以使用带电轻子或缺失的横向能量触发器来选择数据事件。Tevatron实验呈现的组合结果显示了$VH(b\bar{b})$过程的证据，其显著性水平约为3个标准差，而来自运行1数据的组合LHC结果显示了$H\rightarrow b\bar{b}$衰变模式的2.6个标准差证据。在本海报中，总结了使用运行2数据进行的ATLAS $VH(b\bar{b})$检索。

英文摘要：

The Higgs boson discovered at the LHC in 2012 has been observed coupling directly to $W$ and $Z$ bosons and to $τ$ leptons, and indirectly to top quarks. In order to probe whether it is indeed the particle predicted by the Standard Model, direct couplings of the Higgs boson to quarks must also be measured. The Higgs boson decays most often to a pair of bottom quarks (with a branching ratio of 58%). When the Higgs boson is produced alone in gluon-gluon fusion, the signal in this decay mode is overwhelmed by the regular multi-jet background. By requiring the Higgs boson to be produced in association with a vector boson $V$ ($W$ or $Z$), which is further required to decay leptonically, data events can be selected using charged-lepton or missing transverse energy triggers. The Tevatron experiments presented combined results showing evidence for the $VH(b\bar{b})$ process at a significance level of about 3 standard deviations, while the combined LHC results from Run-1 data show a 2.6 standard deviation evidence for the $H\rightarrow b\bar{b}$ decay mode. In this poster, the ATLAS $VH(b\bar{b})$ search using Run-2 data is summarised.

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英文摘要：

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