Resonance-continuum interference in the di-photon Higgs signal at the LHC

Details Resonance-continuum interference in the di-photon Higgs signal at the LHC Resonance-continuum interference in the di-photon Higgs signal at the LHC

2003-02-25

arxiv.org/abs/hep-ph/0302233v1

Phys.Rev.Lett.90:252001,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.90.252001

A low mass Standard Model Higgs boson should be visible at the Large Hadron Collider through its production via gluon-gluon fusion and its decay to two photons. We compute the interference of this resonant process, gg -> H -> gamma gamma, with the continuum QCD background, gg -> gamma gamma induced by quark loops. Helicity selection rules suppress the effect, which is dominantly due to the imaginary part of the two-loop gg -> gamma gamma scattering amplitude. The interference is destructive, but only of order 5% in the Standard Model, which is still below the 10-20% present accuracy of the total cross section prediction. We comment on the potential size of such effects in other Higgs models.

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