Search for phenomena beyond the Standard Model in events with large b-jet multiplicity using the ATLAS detector at the LHC

Search for phenomena beyond the Standard Model in events with large b-jet multiplicity using the ATLAS detector at the LHC
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使用 LHC 的 ATLAS 探测器在具有大量 b 射流多重性的事件中搜索超出标准模型的现象

DOI:
10.1140/epjc/s10052-020-08730-0
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发表时间:
2021
期刊:
The European Physical Journal C
影响因子:
--
通讯作者:
Aad G
Aad G
中科院分区:
--
文献类型:
--
作者:
Aad G

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具有大量高喷流($ p_ {\text {T}} $$ b $)的事件在标准模型(SM)中是罕见的;具有这种拓扑结构的事件的过量将是超越SM的现象的信号。有一种现象是超对称的一种变体,其中r宇称被违反,允许重子数违反SM粒子的超伴子的衰变。本文介绍了在具有至少8个喷流和至少6个$ b $ -喷流的事件中寻找超越SM的物理。它是使用ATLAS探测器收集的Run 2数据进行的,该数据对应于质心能量为$\sqrt {s}= 13$ TeV的$ pp $碰撞的综合光度为139 fb $^{-1} $。我们特别考虑了一对重顶夸克的产生,它们衰变成$ b $ -夸克和一个电荷,而电荷又通过虚顶夸克衰变成$ bbs $。最主要的背景来源是使用数据驱动技术估计的多射流产量。进行拟合以估计信号强度的预期灵敏度。预期和观测到的95 $\% $ CL上限是根据顶夸克和电荷质量设定的。
Events with a large number of high-$ p_ {\text {T}} $$ b $-jets are rare in the Standard Model (SM); an excess of events with such topology would be a signal of phenomena beyond the SM. One phenomenon where a large excess is expected is a variant of Supersymmetry in which R-parity is violated, allowing baryon number violating decays of the super partners of the SM particles. This document presents the search for physics beyond the SM in events with at least eight jets and at least six $ b $-jets. It was performed using Run 2 data collected by the ATLAS detector corresponding to an integrated luminosity of 139 fb $^{-1} $ of $ pp $ collisions at a center-of-mass energy of $\sqrt {s}= 13$ TeV. We consider specifically the production of a pair of heavy top squarks which decay to a $ b $-quark and a chargino, which in turn decays into $ bbs $ via a virtual top squark. The most dominant source of background is multijet production, estimated using a data-driven technique. A fit is performed to estimate the expected sensitivity of the signal strength. Expected and observed 95$\% $ CL upper limits are set based on the top squark and chargino masses.
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