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arXiv 1403.6293hep-ex
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用ATLAS探测器用$H\toγγ$寻找顶夸克衰变$t\rightarrow qH$

Search for top quark decays $t\rightarrow qH$ with $H\toγγ$ using the ATLAS detector

ATLAS Collaboration

摘要:

在顶夸克衰变为上型($c, u$)夸克和希格斯玻色子(希格斯玻色子衰变为两个光子)的过程中,对变味中性流进行了研究。使用的质子-质子碰撞数据集对应于在LHC的ATLAS实验中收集的在$\sqrt{s}$ = 7 \tev \时的4.7 fb $^{-1}$和在$\sqrt{s}$ = 8 \tev \时的20.3 fb $^{-1}$。搜索顶夸克对事件,其中一个顶夸克衰变到$qH$,另一个衰变到$bW$。使用的$W$玻色子的强子和轻子衰变模式。未观察到明显信号,并在95%置信水平下将$t\rightarrow qH$分支比的上限设定为0.79%。$tqH$偶联组合$\sqrt{λ_{tcH}^{2} + λ_{tuH}^{2}}$的相应限值为0.17。

英文摘要:

A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type ($c, u$) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb$^{-1}$ at $\sqrt{s}$ = 7 \tev\ and 20.3 fb$^{-1}$ at $\sqrt{s}$ = 8 \tev\ collected by the ATLAS experiment at the LHC. Top quark pair events are searched for in which one top quark decays to $qH$ and the other decays to $bW$. Both the hadronic and the leptonic decay modes of the $W$ boson are used. No significant signal is observed and an upper limit is set on the $t\rightarrow qH$ branching ratio of 0.79% at the 95% confidence level. The corresponding limit on the $tqH$ coupling combination $\sqrt{λ_{tcH}^{2} + λ_{tuH}^{2}}$ is 0.17.

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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