Search for electroweak production of a vector-like T quark using fully hadronic final states

Search for electroweak production of a vector-like T quark using fully hadronic final states
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使用完全强子最终态搜索类矢量 T 夸克的电弱产生

DOI:
10.1007/jhep01(2020)036
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发表时间:
2020
影响因子:
5.4
通讯作者:
Flechl, M.
Flechl, M.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sirunyan, A. M.;Tumasyan, A.;Adam, W.;Ambrogi, F.;Bergauer, T.;Brandstetter, J.;Dragicevic, M.;Erö, J.;Escalante Del Valle, A.;Flechl, M.

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使用 2016 年大型强子对撞机 CMS 实验收集的 = 13 TeV 的质子-质子碰撞数据,对与顶夸克或底夸克相关的电荷 2/3 的类矢量顶夸克伴侣 T 的电弱产生进行搜索。数据样本对应于 35.9 fb−1 的积分光度。搜索目标 T 夸克在广泛的质量和分数宽度范围内,衰变到顶部夸克和处于完全强子最终状态的希格斯玻色子或 Z 玻色子。该搜索是使用两个实验上不同的特征来进行的,这些特征取决于顶夸克、希格斯玻色子或Z玻色子衰变中的每个夸克是否产生单独的解析喷流。喷流子结构、b 标记和运动学变量用于识别顶夸克和玻色子喷流,并用于抑制标准模型背景。发现数据与预期背景一致。 95% 置信水平的上限设置在 T 夸克介导的 tHQq、tZQq 及其总和的产生的横截面上,其中 Q 是相关的顶部或底部重夸克,q 是另一个相关夸克。对于各种 T 夸克宽度(最高可达 T 夸克质量的 30%)的每个搜索特征给出了限制,对于 0.6–2.6 TeV 范围内的 T 夸克质量,限制在 2 pb 到 20 fb 之间。这些结果比之前对 T→ tH 的电弱单一产生的搜索明显更敏感,并且代表了使用 Z 玻色子的强子衰变和这种产生模式对 T→ tZ 的第一个约束。
A search is performed for electroweak production of a vector-like top quark partner T of charge 2/3 in association with a top or bottom quark, using proton-proton collision data at= 13 TeV collected by the CMS experiment at the LHC in 2016. The data sample corresponds to an integrated luminosity of 35.9 fb− 1. The search targets T quarks over a wide range of masses and fractional widths, decaying to a top quark and either a Higgs boson or a Z boson in fully hadronic final states. The search is performed using two experimentally distinct signatures that depend on whether or not each quark from the decays of the top quark, Higgs boson, or Z boson produces an individual resolved jet. Jet substructure, b tagging, and kinematic variables are used to identify the top quark and boson jets, and also to suppress the standard model backgrounds. The data are found to be consistent with the expected backgrounds. Upper limits at 95% confidence level are set on the cross sections for T quark-mediated production of tHQq, tZQq, and their sum, where Q is the associated top or bottom heavy quark and q is another associated quark. The limits are given for each search signature for various T quark widths up to 30% of the T quark mass, and are between 2 pb and 20 fb for T quark masses in the range 0.6–2.6 TeV. These results are significantly more sensitive than prior searches for electroweak single production of T→ tH and represent the first constraints on T→ tZ using hadronic decays of the Z boson with this production mode.
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发表时间: 2016-12
期刊: --
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