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arXiv 1905.03271hep-phhep-ex
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Di-Higgs产生的暗和亮特征

Dark and Bright Signatures of Di-Higgs Production

Alexandre Alves, Tathagata Ghosh, Farinaldo S. Queiroz

摘要:

如果希格斯玻色子衰变为一对不可见粒子,那么考虑到当前LHC对希格斯玻色子不可见衰变宽度的限制,每个希格斯玻色子衰变为标准模型(SM)粒子的去希格斯事件的数量将减少三分之二。我们调查的灵敏度即将到来的高亮度运行的大型强子对撞机的双希格斯生产和随后的衰变的背景下,由费米暗物质在黑暗和明亮的通道$γγ+\not\!\! E_T$增强的SM的单重标量扩展的暗物质。一旦考虑背景产率的系统不确定性,在仔细调整提高信号与背景比的运动学切割后,该暗通道和亮通道呈现出比$b\bar{b}+\not\!\! E_T$有竞争力的限制。我们进一步表明,在一个多变量分析中,对于一个不可见的分支分数低至$\sim 10$ %,我们得到更强的界限相比,从$γγ+\not\!\! E_T$通道的$b\bar{b}γγ$最终状态的希格斯三线性耦合。最后,我们证明了三个通道$γγ+\not\!\! E_T$,$b\bar{b}+\not\!\! E_T$和$b\bar{b}γγ$,相互补充,在寻找双希格斯生产与非SM三线性耦合时,存在一个看不见的衰变模式。

英文摘要:

If the Higgs boson decays to a pair of invisible particles, the number of di-Higgs events, where each Higgs decay into Standard Model (SM) particles, are reduced by a factor of two-third taking into account the current LHC bound on invisible decay width of the Higgs boson. We investigate the sensitivity of the upcoming high luminosity run of the LHC to di-Higgs production and subsequent decay to dark matter in the context of the singlet scalar extension of the SM augmented by a fermionic dark matter in the dark and bright channel $γγ+\not\!\! E_T$. Once systematic uncertainties on background yields are considered, this dark and bright channel presents competitive limits than $b\bar{b}+\not\!\! E_T$ after a careful tuning of the kinematical cuts that raise the signal over background ratio. We further show that in a multivariate analysis, for an invisible branching fraction as low as $\sim 10$%, we obtain stronger bounds for the Higgs trilinear coupling from the $γγ+\not\!\! E_T$ channel compared to the $b\bar{b}γγ$ final state. Finally, we demonstrate that the three channels $γγ+\not\!\! E_T$, $b\bar{b}+\not\!\! E_T$ and $b\bar{b}γγ$, complement each other in the search for di-Higgs production with non-SM trilinear couplings when an invisible decay mode is present.

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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