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arXiv 2005.05138hep-ex
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用ATLAS探测器在$\sqrt{s}=13$ TeV上寻找PDMATHAAB碰撞中的全强子末态$t\bar{t}$共振

Search for $t\bar{t}$ resonances in fully hadronic final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

本文利用大型强子对撞机ATLAS探测器在质心能量为$\sqrt{s}=13$ TeV的质子-质子碰撞数据中记录的139 fb $^{-1}$,寻找衰变为一对顶夸克的新的重粒子.搜索使用的事件符合对生产的高横动量顶夸克和随后的衰变到完全强子的最终状态。共振衰减到一个$t\bar{t}$对质量超过1.4 TeV的分析进行了优化,利用一个专用的多变量技术与射流子结构,以确定强子衰变顶夸克使用大半径的喷气机和评估的背景预期数据。未观察到与背景预测的显著偏离。在顶色辅助人工色模型中,对新的$Z'$玻色子的产生截面乘以分支分数进行了限制。在95%的置信水平下,对于衰变宽度分别为1%和3%的情况,排除了质量低于3.9和4.7 TeV的$Z'$玻色子。

英文摘要:

This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb$^{-1}$ of proton--proton collision data recorded at a centre-of-mass energy of $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a $t\bar{t}$ pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new $Z'$ boson in a topcolor-assisted-technicolor model. The $Z'$ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.

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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