Next-to-leading order QCD corrections to Higgs boson decay to quarkonium plus a photon

In this paper, we investigate the decay of Higgs boson to $J\mathrm{/}\psi (\mathrm{{\rm Y}})$ plus a photon based on NRQCD factorization. For the direct process, we calculate the decay width up to QCD NLO. We find that the decay width for process $H\to J\mathrm{/}\psi (\mathrm{{\rm Y}})+\gamma$ direct production at the LO is significantly reduced by the NLO QCD corrections. For the indirect process, we calculate the $H\to {\gamma }^{\ast }\gamma$ with virtual $\gamma$ substantially decaying to $J\mathrm{/}\psi (\mathrm{{\rm Y}})$, including all the SM Feynman diagrams. The decay width of indirect production is much larger than the direct decay width. Since it is very clean in experiment, the $H\to J\mathrm{/}\psi (\mathrm{{\rm Y}})+\gamma$ decay could be observable at a 14 TeV LHC and it also offers a new way to probe the Yukawa coupling and New Physics at the LHC.