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arXiv 1911.09255hep-ph
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用Higgs特征化模型和top关联产生研究Higgs $\boldsymbol{CP}$的性质

A study of Higgs $\boldsymbol{CP}$ properties using the Higgs Characterization Model and top associated production

Martin Mosny

摘要:

本研究利用Higgs特征化模型,通过$tH$和$t\bar{t}H$产生过程,研究了Higgs与顶夸克耦合的$CP$性质.这是通过模拟质子-质子碰撞与ATLAS检测器条件,这是计算七个不同的$CP$本征态使用MadGraph5_aMC@NLO。三个正交类别的削减随后实施,以找到削减效率,这是结合使用的横截面,以找到信号强度。将信号强度与实验结果相比较,我们还不能最终排除任何希格斯$CP$本征态。直方图分析显示,最敏感的$CP$变量是希格斯粒子、轻子和光子的横动量,当希格斯粒子耦合变得$CP$奇数时,横动量会变得更硬。

英文摘要:

This study utilises the Higgs Characterization model to investigate the $CP$ properties of the Higgs coupling to the top quark using the $tH$ and $t\bar{t}H$ generation processes. This is done via simulations of proton-proton collisions with ATLAS detector conditions, which are calculated for seven different $CP$ eigenstates using MadGraph5_aMC@NLO. Three orthogonal categories of cuts are subsequently implemented to find the cut efficiencies, which are used in conjunction with the cross-section to find the signal strength. Comparing the signal strength with experimental results shows that one cannot yet conclusively rule out any Higgs $CP$ eigenstates. Analysing histograms showed that the most $CP$ sensitive variables were the transverse momenta of the Higgs, leptons and photons, which showed a hardening as the Higgs coupling became $CP$ odd.

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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