Higher-order perturbative calculations find destructive signal-background interference in gg to H to gamma gamma and Z gamma, lowering the resonant production rate by approximately 1.6% and 3%.
A complete O(alpha_S^2) calculation of the signal-background interference for the Higgs diphoton decay channel
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abstract
We present the full ${\cal O}(\as^2)$ computation of the interference effects between the Higgs diphoton signal and the continuum background at the LHC. While the main contribution to the interference originates on the $gg$ partonic subprocess, we find that the corrections from the $qg$ and $q\bar{q}$ channels amount up to 35% of it. We discuss the effect of these new subprocesses in the shift of the diphoton invariant mass peak recently reported by S. Martin in Ref.\cite{Martin:2012xc}.
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Interference effects in gluon-fusion Higgs boson production
Higher-order perturbative calculations find destructive signal-background interference in gg to H to gamma gamma and Z gamma, lowering the resonant production rate by approximately 1.6% and 3%.