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arXiv 1707.01404hep-ex
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用ATLAS探测器在$\sqrt{s} = 13$ TeV $pp$碰撞中用$H\toγγ$寻找顶夸克衰变$t \rightarrow qH$

Search for top quark decays $t \rightarrow qH$, with $H\toγγ$, in $\sqrt{s} = 13$ TeV $pp$ collisions using the ATLAS detector

ATLAS Collaboration

摘要:

本文提出了一种寻找味道变化的中性流在顶夸克衰变为上型($q = c, u$)夸克和希格斯玻色子,其中希格斯玻色子衰变为两个光子。质子-质子碰撞数据集分析的金额为36.1 FB $^{-1}$在$\sqrt{s} = 13$ TeV收集的ATLAS实验在LHC。寻找顶夸克对事件,其中一个顶夸克衰变为$qH$,另一个衰变为$bW$。$W$玻色子的强子和轻子衰变模式都被使用。未观察到显著过量,并在95%置信水平下对$2.2\times 10^{-3}$的$t \rightarrow cH$分支比设定上限,而在无信号时的预期限度为$1.6 \times 10^{-3}$。在95%置信水平下,$tcH$耦合的相应限值为0.090。观测到的$t \rightarrow uH$支化比上限为$2.4 \times 10^{-3}$。

英文摘要:

This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type ($q = c, u$) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton--proton collision data set analysed amounts to 36.1 fb$^{-1}$ at $\sqrt{s} = 13$ TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into $qH$ and the other decays into $bW$. Both the hadronic and leptonic decay modes of the $W$ boson are used. No significant excess is observed and an upper limit is set on the $t \rightarrow cH$ branching ratio of $2.2\times 10^{-3}$ at the 95% confidence level, while the expected limit in the absence of signal is $1.6 \times 10^{-3}$. The corresponding limit on the $tcH$ coupling is 0.090 at the 95% confidence level. The observed upper limit on the $t \rightarrow uH$ branching ratio is $2.4 \times 10^{-3}$.

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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