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arXiv 1303.0763hep-ex
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在LHC寻找pp碰撞中顶夸克对产生的标准模型希格斯玻色子

Search for the standard model Higgs boson produced in association with a top-quark pair in pp collisions at the LHC

CMS Collaboration

摘要:

搜索的标准模型希格斯玻色子与顶夸克对产生的数据样本对应的积分亮度为5.0反femtobarns(5.1反femtobarns)收集在pp碰撞在7 TeV(8 TeV)的质心能量。事件被认为是顶夸克对衰变到一个轻子+喷流(t tbar到ell nu q' b bbar)或双轻子(t tbar到ell(+)nu ell(-)nu b bbar),ell是电子或μ子。该搜索针对衰减模式H到b bbar进行优化。t tbar H信号的最大背景是顶夸克对的产生和额外的喷流。人工神经网络用于区分信号和背景事件。结合7 TeV和8 TeV样品的结果,对于125 GeV的Higgs玻色子质量,Higgs玻色子与顶夸克对相关的横截面的观测(预期)极限是标准模型预期的5.8(5.2)倍。

英文摘要:

A search for the standard model Higgs boson produced in association with a top-quark pair is presented using data samples corresponding to an integrated luminosity of 5.0 inverse femtobarns (5.1 inverse femtobarns) collected in pp collisions at the center-of-mass energy of 7 TeV (8 TeV). Events are considered where the top-quark pair decays to either one lepton+jets (t tbar to ell nu q q' b bbar) or dileptons (t tbar to ell(+) nu ell(-) nu b bbar), ell being an electron or a muon. The search is optimized for the decay mode H to b bbar. The largest background to the t tbar H signal is top-quark pair production with additional jets. Artificial neural networks are used to discriminate between signal and background events. Combining the results from the 7 TeV and 8 TeV samples, the observed (expected) limit on the cross section for Higgs boson production in association with top-quark pairs for a Higgs boson mass of 125 GeV is 5.8 (5.2) times the standard model expectation.

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