Higgs_Effective_Couplings h( -> \gamma \gamma)tt~
Dear Olivier,
I am trying to generate events for the following process: tth, with $h -> \gamma \gamma$ using the Higgs effective couplings UFO file. However, the cross-section is very small. For a sanity check, I just run the gg > h t t~, without decaying either top or Higgs, using both the SM and the Higgs effective couplings.
generate g g > h t t~, sigma = 0.285 ± 0.0033 pb (using SM),
generate g g > h t t~, sigma = 0.0003412 ± 4.3e-06 pb (with Higgs effective couplings UFO).
Note that I didn't enforce any generation-level cuts in both cases. I am a bit puzzled because of the large discrepancy. The small cross-section, while using Higgs-effective couplings UFO file, leads to a very negligible cross-section of gg -> tt~h(-> \gamma \gamma), which is not the true case.
Many thanks for any help in solving this issue.
Best
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