对齐THDM中$h\longrightarrowγγ$的双圈BSM修正
On the two-loop BSM corrections to $h\longrightarrowγγ$ in the aligned THDM
AI总结:
本文计算对齐THDM中$h\toγγ$衰变宽度的双圈BSM修正,利用低能定理简化计算,并指出在大四次希格斯耦合下这些修正对精确确定衰变宽度至关重要。
摘要:
我们计算了对齐THDM中$h\longrightarrow γγ$衰变宽度的双圈BSM贡献。我们采用电弱规范耦合为零以及SM类希格斯玻色子质量为零的简化假设,这使得我们能够利用一个低能定理,将$hγγ$振幅与光子自能对希格斯场的导数联系起来。我们简要讨论了新计算贡献的数值影响,表明在四次希格斯耦合较大的情景中,这些贡献可能对于精确确定$Γ[h\rightarrow γγ]$是必需的。
英文摘要:
We compute the two-loop BSM contributions to the $h\longrightarrow γγ$ decay width in the aligned THDM. We adopt the simplifying assumptions of vanishing EW gauge couplings and vanishing mass of the SM-like Higgs boson, which allow us to exploit a low-energy theorem connecting the $hγγ$ amplitude to the derivative of the photon self-energy w.r.t. the Higgs field. We briefly discuss the numerical impact of the newly-computed contributions, showing that they may be required for a precise determination of $Γ[h\rightarrow γγ]$ in scenarios where the quartic Higgs couplings are large.
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