Two-loop Electroweak corrections to the Higgs boson rare decay process H→ Zγ
arxiv(2024)
摘要
Recently, ATLAS and CMS collaborations jointly announced the first evidence
of the rare Higgs boson decay channel H→ Zγ, with a ratio of 2.2±
0.7 times overshooting the leading order standard model (SM) prediction. In
order to face this challenge, it is urgent to proceed an even accurate
calculation within the SM. To this end, we calculate in this paper the
next-to-leading order (NLO) electroweak (EW) corrections to H→ Zγ
process, in which the NLO quantum chromodynamics (QCD) corrections were found
tiny. Our calculation finds that the inclusion of NLO EW corrections may
greatly enhance the prediction reliability. To tame the theoretical
uncertainty, we adopt five different renormalization schemes. Combining our
result with previous NLO QCD corrections and the signal-background
interference, we conclude that the excess in H→ Zγ cannot be explained
within the SM. In fact, the incompatibility between the SM prediction and the
LHC measurement of the concerned process is exacerbated upon considering the
higher order EW corrections, which implies something beyond the SM could be
involved.
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