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arXiv 1708.03580hep-ph
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在强子对撞机上产生$HHH$和$HHV(V=γ,Z)$

Production of $HHH$ and $HHV(V=γ,Z)$ at the hadron colliders

Pankaj Agrawal, Debashis Saha, Ambresh Shivaji

摘要:

我们考虑在强子对撞机上产生两个希格斯玻色子与一个规范玻色子或另一个希格斯玻色子。我们在标准模型中计算过程$ p p \to H H H $和$H H Z$的截面和分布。特别地,我们计算了胶子-胶子融合的单圈贡献介导的重夸克的循环。这是对$ p p \to H H H $过程的主要贡献。对于过程$ p p \to H H Z $,它是QCD耦合中的次-次-首阶(NNLO)贡献。我们还比较了这一贡献的下一个领导阶(NLO)QCD贡献这个过程。在大型强子对撞机(LHC)中,NNLO的贡献可以与NLO的贡献相似,而在更高质心能量的机器中,NNLO的贡献要大得多。我们还研究了新的物理效应,在这些过程中考虑$ttH, HHH, HHHH, HZZ$,和$HHZZ$相互作用的异常。反常耦合可以显著增强截面。$gg \to HHH$过程对异常三线性希格斯玻色子自耦合特别敏感。对于$gg \to HHZ$过程,存在对异常$HZZ$耦合的适度依赖。

英文摘要:

We consider the production of two Higgs bosons in association with a gauge boson or another Higgs boson at the hadron colliders. We compute the cross sections and distributions for the processes $ p p \to H H H $ and $H H Z$ within the standard model. In particular, we compute the gluon-gluon fusion one-loop contributions mediated via heavy quarks in the loop. It is the leading order contribution to $ p p \to H H H $ process. To the process $ p p \to H H Z $, it is next-to-next-to-leading-order (NNLO) contribution in QCD coupling. We also compare this contribution to the next-to-leading-order (NLO) QCD contribution to this process. The NNLO contribution can be similar to NLO contribution at the Large Hadron Collider (LHC), and significantly more at higher center-of-mass energy machines. We also study new physics effects in these processes by considering $ttH, HHH, HHHH, HZZ$, and $HHZZ$ interactions as anomalous. The anomalous couplings can enhance the cross sections significantly. The $gg \to HHH$ process is specially sensitive to anomalous trilinear Higgs boson self-coupling. For the $gg \to HHZ$ process, there is some modest dependence on anomalous $HZZ$ couplings.

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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