How to make a UFO model calculates the width of particle without making it decay??

Asked by Igal


This question is linked to question #682829 (

I would like the UFO model to calculate the particle width of a customized model without making this particle decay. Is there a way to do that?

Also with the following commands

process DECAY = "zp" => "mu+", "mu-"

error_threshold = 1E-8
auto_decays_multiplicity = 2
?auto_decays_radiative = false
unstable "zp" () { ?auto_decays = true }

I have this error: FATAL ERROR: Mismatch of process and beam setup (scattering/decay)

but if unstable "zp" () { ?auto_decays = true } is replaced by unstable "zp" (DECAY) it is working

Also to which value should be set the error_threshold?

Thanks, Igal.

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Juergen Reuter (j.r.reuter) said :