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arXiv · 2208.05153

Probing the $Hγγ$ coupling via Higgs exclusive decay into quarkonia plus a photon at the HL-LHC

Hongxin Dong·Peng Sun·Bin Yan
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Abstract

It is well know that the precise measurement of $H\toγγ$ can generate two degenerate parameter spaces of $Hγγ$ anomalous coupling. We propose to utilize the exclusive Higgs rare decays $H\toΥ(ns)+γ$ to break above mentioned degeneracy and further to constrain the $Hγγ$ anomalous coupling at the HL-LHC. We demonstrate that the branching ratios of $H\toΥ(ns)+γ$ can be significantly enhanced in the non-SM-like parameter space from $H\toγγ$ measurement, due to the destructive interference between the direct and indirect production of $Υ(ns)$ in the SM. By applying the NRQCD factorization formalism, we calculate the partial decay widths of $H\toΥ(ns)+γ$ at the NLO accuracy of $α_s$. We show that it is hopeful to break such degenerate parameter space at the HL-LHC if we can further highly suppress the background and enhance the signal efficiency compared to the ATLAS preliminary simulation.

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Hongxin Dong, Peng Sun, Bin Yan. 2022-10-31. Probing the $Hγγ$ coupling via Higgs exclusive decay into quarkonia plus a photon at the HL-LHC. https://doi.org/10.1103/physrevd.106.095013

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