Long-Bin Chen, Cong-Feng Qiao, Rui-Lin Zhu
To ascertain the recently observed boson at about 125 {GeV} by CMS and ATLAS Collaborations to be the Standard Model Higgs and determine its properties, there still needs more measurement on currently observed channels and more. In this work we reanalyze the processes of the Standard Model Higgs boson radiative decays to lepton pairs at one-loop level on the condition of the LHC experiment. Result shows that the loop contributions for $H\rightarrow \ell\bar{\ell}\gamma (\ell=e,\mu)$ dominate over the Born level ones. In case the photon and leptons are hard, possessing energies larger than 1 {GeV}, the branching fractions of $H\rightarrow \ell\bar{\ell}\gamma (\ell=e or \mu)$ processes are about two-thirds of the $H\rightarrow\mu^+\mu^-$ process. Since the lepton-pair yields of the radiative processes mainly come from the Z-boson conversion, which may greatly suppress the background, we believe their signals should be observed in presently accumulated data or in the next run of the LHC experiment, provided the Standard Model Higgs is indeed light.
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http://arxiv.org/abs/1211.6058
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