The light-quark contribution to H to gamma gamma and H to gamma Z is nonzero and linear in quark masses, with a large enhancement in the two-photon channel.
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On the contribution from the light quarks to $H\to\gamma\gamma , \gamma Z$
The light-quark contribution to H to gamma gamma and H to gamma Z is nonzero and linear in quark masses, with a large enhancement in the two-photon channel.