arXiv 2005.089002020-05hep-ex

在$\sqrt{s} =$ 13 TeV质子-质子碰撞中H $\to $ cs通道中寻找轻荷希格斯玻色子

Search for a light charged Higgs boson in the H$^\pm$ $\to $ cs channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

备注：: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-18-021 (CMS Public Pages)
发表信息：: Phys. Rev. D 102, 072001 (2020)
DOI：: 10.1103/PhysRevD.102.072001

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摘要：

对顶夸克衰变产生的低质量带电希格斯玻色子玻色子进行了研究，该玻色子随后衰变为粲夸克和奇夸克。该数据样本是在大型强子对撞机的CMS实验中以$\sqrt{s} =$ 13 TeV的质子-质子碰撞记录的，对应于35.9 fb $^{-1}$的积分亮度。搜索是在顶夸克对产生的过程中进行的，其中一个顶夸克衰变为底夸克和带电的希格斯玻色子玻色子，另一个衰变为底夸克和W玻色子。随着W玻色子衰变为带电轻子（电子或μ子）和中微子，最终态包括一个孤立的轻子，缺少横向动量，和至少四个喷注，其中两个被标记为b喷注。为了提高搜索的灵敏度，来自带电的希格斯玻色子的喷流之一需要满足魅力标记选择。在双射流不变质量分布中没有发现超过标准模型预测的显著过量。对于带电希格斯玻色子玻色子质量在80 ~ 160 GeV之间的情况，顶夸克衰变为带电希格斯玻色子玻色子和底夸克的分支分数的上限在1.68-0.25%之间。

英文摘要：

A search is conducted for a low-mass charged Higgs boson produced in a top quark decay and subsequently decaying into a charm and a strange quark. The data sample was recorded in proton-proton collisions at $\sqrt{s} =$ 13 TeV by the CMS experiment at the LHC and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The search is performed in the process of top quark pair production, where one top quark decays to a bottom quark and a charged Higgs boson, and the other to a bottom quark and a W boson. With the W boson decaying to a charged lepton (electron or muon) and a neutrino, the final state comprises an isolated lepton, missing transverse momentum, and at least four jets, of which two are tagged as b jets. To enhance the search sensitivity, one of the jets originating from the charged Higgs boson is required to satisfy a charm tagging selection. No significant excess beyond standard model predictions is found in the dijet invariant mass distribution. An upper limit in the range 1.68-0.25% is set on the branching fraction of the top quark decay to the charged Higgs boson and bottom quark for a charged Higgs boson mass between 80 and 160 GeV.

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