发表机构
CERN（欧洲核子研究组织）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在13 TeV质子碰撞中搜索矢量样顶夸克对衰变至标量玻色子和顶夸克，未发现显著信号，并设置了产生截面与分支比乘积的上限。
AI 中文摘要
本文报道了对成对产生的矢量样顶夸克 T 衰变为一个新标量玻色子 $\phi$ 和一个标准模型（SM）顶夸克的搜索。该搜索针对包含一个光子对（源自其中一个标量玻色子的衰变）且伴随 SM 顶夸克对全强子衰变的事件。分析针对增强顶夸克特征进行了优化，其中顶夸克的衰变产物被重建为大半径喷注。搜索基于 CERN LHC 上 CMS 实验在 2016-2018 年期间收集的质子-质子碰撞数据，对应积分亮度为 138 fb$^{-1}$。搜索针对一系列 T 和 $\phi$ 质量进行。未观察到与预测背景有显著偏差。最大局部超出具有 2.7 个标准偏差的显著性，在考虑 look-elsewhere 效应后降至 1.5 个标准偏差。在 95% 置信水平上，对 $\mathrm{T\bar{T}}$ 产生截面与分支比的乘积设置了上限。
英文摘要
A search for pair-produced vector-like top quarks, T, decaying into a new scalar boson $ϕ$ and a standard model (SM) top quark is presented. The search targets events containing a photon pair originating from the decay of one of the scalar bosons, accompanied by all-hadronic decays of the SM top quark pair. The analysis is optimized for boosted top quark signatures in which the decay products of the top quarks are reconstructed as large-radius jets. The search is based on proton-proton collision data at $\sqrt{s}$ = 13 TeV, collected by the CMS experiment at the CERN LHC during 2016$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The search is performed for an array of T and $ϕ$ masses. No significant deviation from the predicted background is observed. The largest local excess has a significance of 2.7 standard deviations, reduced to 1.5 standard deviations after accounting for the look-elsewhere effect. Upper limits at 95% confidence level are set on the product of $\mathrm{T\bar{T}}$ production cross section and the branching fraction.
CommentsSubmitted to Physical Review D. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-24-016 (CMS Public Pages)
