WHIZARD

Higgs -> gamma, gamma decay

Asked by Yegor Vasenin

Hello,

we want to study Higgs decay to gamma, gamma which goes through the loop (with W and top-quark mainly). Since this process is not described by tree level diagrams, it can't be calculated with SM Whizard. Could you advise on how to calculate this process, maybe there is UFO model?

Thank you in advance,
Best regards, Yegor

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English Edit question
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WHIZARD Edit question
Assignee:
Juergen Reuter Edit question
Solved by:
Yegor Vasenin
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Juergen Reuter (j.r.reuter) said (last edit ): 		#1

Hi Yegor,
please the model SM_Higgs. This contains the 3 loop-induced vertices H -> AA, H -> AZ and H -> gg. One has to apply a bit of care here, as this coupling might show up in production processes. There it can be excluded using the syntax
$restrictions = "^[H,A,Z]"
from the Higgsstrahlung process. Note that this model also contains a H-electron vertex, in order to get only the default single Feynman diagram for Higgsstrahlung, use
$restrictions = "^[H,e+:A:Z,e-:A]"
Cheers,
      Juergen

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Yegor Vasenin (esvasenin) said : 		#2

Thank you very much, Juergen! This helped me a lot.

Best regards,
Yegor