May 16 – 20, 2022
Europe/Zurich timezone

Rare Higgs Decays in the Standard Model

May 17, 2022, 7:00 PM
Theory poster Higgs Physics Poster Session I


Xi Gong


After the discovery of Higgs boson by the ATLAS and CMS Collaborations, a new era of the precise determination of the properties of this new particle has begun. In recent years, experimental searches for rare Higgs decays, like $h\to V\gamma$ ($V$ denotes vector mesons $\rho$, $\phi$, $J/\psi$ and $\Upsilon$ etc.) and $h\to VV (V=J/\Psi, \Upsilon$) have been performed at the LHC.

Motivated by the above experimental studies, we have presented the theoretical analysis of rare processes, including Higgs decays into lepton pair plus one light hadron and decays into a pair of heavy vector quarkonia, in the standard model (SM). Higgs couplings to gauge bosons and Yukawa couplings play interesting roles in these decays. Our calculation shows that branching ratios of $h\to VV$ are around $10^{-10}$, which are far below the current experimental upper bounds. For lepton pair plus a light hadron final states, their branching ratios are predicted to be in the range of $10^{-8}\sim 10^{-5}$. We have also analyzed the differential dilepton invariant mass and angular distributions of these three-body decays, which may provide interesting information on short-distance dynamics. Due to the small SM branching ratios, it will be in general challenging to search for these rare processes, however, experimental studies of them may be helpful both to increase our understanding of the properties of SM Higgs boson and to potentially probe the novel Higgs dynamics in new physics scenarios.

This poster is mostly based on references:
1. D.-N. Gao and X. Gong, PLB 817 (2021) 136348, arXiv:2103.03050[hep-ph].
2. D.-N. Gao and X. Gong, arXiv:2203.00514[hep-ph].

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