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arXiv 1703.06352hep-ex
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寻找在sqrt(s)= 13 TeV处衰变为顶夸克和类矢量顶夸克的重共振

Search for a heavy resonance decaying to a top quark and a vector-like top quark at sqrt(s) = 13 TeV

CMS Collaboration

摘要:

研究了自旋为1的Z'重共振衰变为顶夸克和类重矢量顶夸克T的情况。搜索是基于在LHC收集的CMS探测器在13 TeV的质子-质子碰撞的2.6反femtobarns的样本。最后的状态,其中T夸克衰变为W玻色子和底夸克的分析是优化的。重点是全喷流终态,其中W玻色子和顶夸克都衰变为夸克,夸克演化为喷流。顶夸克和W玻色子的衰变产物被假设为是高度洛伦兹增强的,不能被重建为单独的喷流,而是被重建为合并的宽喷流。射流子结构和射流味道的识别技术用于区分信号和背景事件。在95%的置信水平下,排除了几个Z'玻色子衰变为T夸克的模型,截面的上限范围为0.13至10 pb,这取决于所选择的假设。这是第一次在全强子末态中寻找一个中性自旋-1重共振衰变为顶夸克和类矢量T夸克。

英文摘要:

A search is presented for massive spin-1 Z' resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 inverse femtobarns sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z' bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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