首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Search for single production of a vector- like T quark decaying to a Z boson and a top quark in proton-proton collisions at root s=13 TeV
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Search for single production of a vector- like T quark decaying to a Z boson and a top quark in proton-proton collisions at root s=13 TeV

机译:搜索像Z玻色子腐烂的矢量样片的单一生产,并在根S = 13 TEV的质子 - 质子碰撞中的顶级夸克

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摘要

A search is presented for single production of a vector-like quark (T) decaying to a Z boson and a top quark, with the Z boson decaying leptonically and the top quark decaying hadronically. The search uses data collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb(-1). The presence of forward jets is a particular characteristic of single production of vector-like quarks that is used in the analysis. For the first time, different T quark width hypotheses are studied, from negligibly small to 30% of the new particle mass. At the 95% confidence level, the product of cross section and branching fraction is excluded above values in the range 0.26-0.04 pb for T quark masses in the range 0.7-1.7 TeV, assuming a negligible width. A similar sensitivity is observed for widths of up to 30% of the T quark mass. The production of a heavy Z' boson decaying to Tt, with T - tZ, is also searched for, and limits on the product of cross section and branching fractions for this process are set between 0.13 and 0.06pbfor Z' boson masses in the range from 1.5 to 2.5 TeV. (C) 2018 The Author(s). Published by Elsevier B.V.
机译:搜索是为了单一生产用于腐烂到Z玻色子和顶部夸克的载体样夸克(t),Z玻色子腐烂,顶部夸克腐烂的ZOSON衰减。该搜索使用CMS实验中的CMS实验收集的数据在2016年的13 TEV的质量中心,对应于35.9 fb(-1)的集成光度。向前喷射的存在是在分析中使用的载体样夸克的单一生产的特定特征。首次,研究了不同的T夸克宽度假设,从忽略的小到新粒子质量的30%。在95%的置信水平下,横截面和分支级分的产物被排除在0.26-0.04pb范围内的值0.7-1.7 tev范围为0.26-0.04pb的范围内,假设宽度可忽略不计。观察到相似的灵敏度,宽度高达30%的T夸克质量。生产重型Z'玻色子腐烂到TT,用T - & TZ也被搜查,并且该过程的横截面和分支级分的乘积的限制设定在0.13和0.06pb中的Z'玻色子,其范围为1.5至2.5 Tev。 (c)2018年作者。由elsevier b.v出版。

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