Search for top quark decays t ? qH, with H ? ??, in s = 13 $$ \sqrt{s}=13 $$ TeV pp collisions using the ATLAS detector
Search for top quark decays t ? qH, with H ? ??, in s = 13 $$ \sqrt{s}=13 $$ TeV pp collisions using the ATLAS detector
复制标题
寻找顶夸克衰变 t ？
DOI：
10.1007/jhep10(2017)129
复制
发表时间：
2017
影响因子：
5.4
通讯作者：
Aaboud M
中科院分区：
文献类型：
--
作者：
Aaboud M
本文介绍了在顶夸克衰变成上型夸克（q = c, u）夸克和希格斯玻色子（希格斯玻色子衰变成两个光子）的过程中寻找改变味道的中性电流。所分析的质子-质子碰撞数据集由大型强子对撞机上的ATLAS实验收集，在s√=13 TeV下达到36.1 fb−1。寻找一个顶夸克衰变成qH，另一个顶夸克衰变成bW的顶夸克对事件。W玻色子的强子和轻子衰变模式都被使用。在95%置信水平下，t→cH分支比的上限为2.2 × 10−3，没有信号时的期望上限为1.6 × 10−3。在95%置信水平下，tcH耦合的相应极限为0.090。观察到的t→uH分支比的上限为2.4 × 10−3。
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 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 → cH branching ratio of 2.2 × 10−3 at the 95% confidence level, while the expected limit in the absence of signal is 1.6 × 10−3. The corresponding limit on the tcH coupling is 0.090 at the 95% confidence level. The observed upper limit on the t → uH branching ratio is 2.4 × 10−3.