$O(α^2 G_F m^2_t)$ Contributions to $H\toγγ$

Details $O(α^2 G_F m^2_t)$ Contributions to $H\toγγ$ $O(α^2 G_F m^2_t)$ Contributions to $H\toγγ$

1996-05-15

arxiv.org/abs/hep-ph/9605310v2

Phys.Lett. B396 (1997) 225-230

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex, 2 figures using axodraw style. Revised version corrects for calculational errors and incudes some details

Scientific paper

The rare decay $H\to \gamma\gamma$ is a promising detection channel for an intermediate mass Higgs boson. We compute its two-loop $O(\alpha^2 G_F m_t^2)$ correction in the standard model and find that the relative correction to the decay rate runs between $0.7%$ and $0.5%$ for $M_H=80-150$ GeV. The analogous correction to the amplitude for $gg\to H$ is recovered as a special case. The generalization of our result to other models is also briefly indicated.

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