Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair

Understand

The Higgs-boson decay h -> gamma l+ l- for various lepton states l = (e, mu, tau) is analyzed.

• The differential decay width and forward-backward asymmetry are calculated as functions of the dilepton invariant mass in a model where the Higgs boson interacts with leptons and quarks via a mixture of scalar and pseudoscalar couplings.
• These couplings are partly constrained from data on the decays to leptons, h -> l+ l-, and quarks h -> q \bar{q} (where q = (c, b)), while the Higgs couplings to the top quark are chosen from the two-photon and two-gluon decay rates.
• Nonzero values of the forward-backward asymmetry will manifest effects of new physics in the Higgs sector.