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arXiv 1503.06470hep-ph
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在具有背景干扰的$h \to Zγ$中探测CP破坏

Probing CP Violation in $h \to Zγ$ with Background Interference

Marco Farina, Yuval Grossman, Dean J. Robinson

摘要:

我们发现,宇称的$h Zγ$顶点可以探测胶子融合希格斯生产,$gg \to h \to γZ \to γ\ell^+\ell^-$,和背景,$gg \to γZ \to γ\ell^+\ell^-$,振幅之间的干扰。在宇称违反$hZγ$顶点的存在下,与标准模型(SM)的预期相比,这种干涉改变了轻子和光子的运动学分布。对于具有SM尺寸宽度和耦合的Higgs,我们发现效应的大小最多在$10^{-2}$水平进入。即使在未来的高亮度下,LHC也无法看到如此小的效应。如果存在其他更宽的标量粒子,它们具有更大的产生截面乘以$Zγ$的分支比,则可以用这种技术探测它们的$Zγ$耦合的宇称结构。

英文摘要:

We show that the parity of the $h Zγ$ vertex can be probed by interference between the gluon fusion Higgs production, $gg \to h \to γZ \to γ\ell^+\ell^-$, and the background, $gg \to γZ \to γ\ell^+\ell^-$, amplitudes. In the presence of a parity violating $hZγ$ vertex, this interference alters the kinematic distribution of the leptons and photon compared to Standard Model (SM) expectations. For a Higgs with SM-sized width and couplings, we find that the size of the effect enters at most at the $10^{-2}$ level. Such a small effect cannot be seen at the LHC, even with futuristic high luminosities. Should there exist other broader scalar particles with larger production cross-section times branching ratio to $Zγ$, then the parity structure of their $Zγ$ couplings can be probed with this technique.

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