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arXiv 2407.06267hep-phhep-exnucl-th
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在2HDM中对152 GeV伴随双光子产生超出的解释

Explanation of the excesses in associated di-photon production at 152 GeV in 2HDM

Sumit Banik, Andreas Crivellin

AI总结:

本文通过新Higgs玻色子的Drell-Yan产生解释ATLAS在152 GeV伴随双光子产生的超出,发现在双Higgs二重态模型中新中性Higgs到光子分支比约2%时显著性可达约4σ。

摘要:

在ATLAS(使用完整的run-2数据集)的SM Higgs分析的旁带中,伴随双光子产生($γγ+X$)在约152 GeV处存在统计显著的超出。它们在单$τ$、缺失横能、四喷注和$\geqslant1\ell+\\!\geqslant1b$-jet通道中最为显著(约$3σ$),并且可以通过新Higgs玻色子的Drell-Yan产生来解释,即$pp\to W^*\to H^±H^0$。我们首先在简化模型方法中考察这些超出,考虑$H^±$衰变为$τν$、$WZ$或$tb$。$τν$和$tb$衰变模式各自单独导致约$\lessapprox4σ$的显著性,而对于$WZ$最多可获得$3.5σ$。这是因为$WZ$的衰变导致多个轻子贡献于在152 GeV处未显示超出的双轻子通道。接下来,我们考虑双Higgs二重态模型,其中带电Higgs不在树级衰变为$WZ$,发现对于新中性Higgs到光子的分支比约为2%时,显著性为$\gtrapprox4σ$。尽管该分支比例相当大,但它可以在复合模型中或通过打破通常施加的$Z_2$对称性的Lagrangian项$λ_6 H_1^\dagger H_1 H_2^\dagger H_1+{\rm h.c.}$获得。

英文摘要:

Statistically significant excesses exist at around 152 GeV in associated di-photon production ($γγ+X$) in the sidebands of SM Higgs analyses of ATLAS (using the full run-2 dataset). They are most pronounced in the single-$τ$, missing-transverse-energy, four-jet and $\geqslant1\ell+\!\geqslant1b$-jet channels ($\approx3σ$) and can be explained by the Drell-Yan production of new Higgs bosons, i.e. $pp\to W^*\to H^\pm H^0$. We first examine the excesses in a simplified model approach, considering that $H^\pm$ decays to $τν$, $WZ$ or $tb$. Both the $τν$ and $tb$ decay modes individually lead to a significance of $\lessapprox4σ$ while for $WZ$ one can obtain at most $3.5σ$. This is because the decays of $WZ$ lead to multiple leptons contributing to the two-lepton channel which does not show an excess at 152 GeV. Next, we consider two-Higgs-doublet models where the charged Higgs does not decay to $WZ$ at tree-level, finding a significance of $\gtrapprox4σ$ for a branching ratio of the new neutral Higgs to photons of $\approx$2%. Even though this branching fraction is quite sizable, it can be obtained in composite models or via the Lagrangian term $λ_6 H_1^\dagger H_1 H_2^\dagger H_1+{\rm h.c.}$ breaking the commonly imposed $Z_2$ symmetry.

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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