WHIZARD

Auto decay of H and W

Asked by Christopher Potter on 2019-08-08

Dear Whizard Authors,

When I try to decay the 125 GeV Higgs to off shell decay products, e.g. H->WW* or H->ZZ* I get an error indicating that there is no phase space available.

I also see that W decays to off-diagonal CKM are not implemented.

Please excuse me if I have not understood how to do these things. But it seems that by now when I request auto decay all of this should be correctly implemented.

I am a great fan of your program and I look forward to using it in future.

Best Regards,

Chris Potter

Question information

Language:
English Edit question
Status:
Solved
For:
WHIZARD Edit question
Assignee:
Juergen Reuter Edit question
Solved by:
Juergen Reuter
Solved:
2019-08-22
Last query:
2019-08-22
Last reply:
2019-08-21
Best Juergen Reuter (j.r.reuter) said : #1

Dear Chris,
the model SM (which is the standard model of WHIZARD) is flavor-diagonal as this is for most cases sufficient for collider physics. If you want a full CKM matrix, please set the model as
model = SM_CKM
The auto_decay option takes as default only two-body decays, while H -> ZZ* and H -> WW* are formally three-body decays,
namely H -> Z jj , H -> Zll, H -> Zvv etc. I think you should get them by setting
auto_decays_multiplicity = 3
Best,
    JRR

Juergen Reuter (j.r.reuter) said : #2

I assume that this answered your question, marking as solved. Otherwise, please open the question again.

Christopher Potter (c-t-potter) said : #3

Hi Juergen,

Yes, apologies for the late response. This was exactly what I needed.

Thanks,

Chris

Christopher Potter (c-t-potter) said : #4

Thanks Juergen Reuter, that solved my question.