error in computing decay widths

 New model should be checked before usage.
  Under GUI interface use menus
        Edit Model
               CHECK MODEL

More likely using this way you'll get error message.
In particular m0,m1,m2,m3,... are reserved for Lorentz indexes
and can not be used for variables.

Best
     Alexander Pukhov

First of all thank you so much. I did check my model and was able to fix possible errors. There is one more problem though, it is taking HUGE amount of time in generating .lhe file, for ~20,000 events. Any suggestion on how to run "event_mixer?"

It could be. For some tasks like 2->4 processes CalcHEP works slowly.
But in some cases problem can be solved. If you send me your model and batch file, I'll try to find a time to look one this problem.

Best
    Alexander Pukhov

Do you still have problem?

I am facing a similar issue. I changed the muon mass to 100GeV for testing something but the decay widths are coming out to be negative. Setting the Force Unitary gauge did not change anything.

Which model are you talking about and how do you evaluate the muon width?
This definitely not he case of the SM model which
does not have the problem.
If this problem appears in your own model,
this could be an indication that you have incorrectly implemented it,
or the model is not gauge invariant, i.e. has the problem.
Alexander

On 07/03/2021 11:15, Pradyumna wrote:
> Question #279895 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/279895
>
> Pradyumna requested more information:
> I am facing a similar issue. I changed the muon mass to 100GeV for
> testing something but the decay widths are coming out to be negative.
> Setting the Force Unitary gauge did not change anything.
>

--
______________________________________________________________________
Prof. Alexander S Belyaev (<email address hidden>)
https://www.hep.phys.soton.ac.uk/content/alexander-belyaev

School of Physics & Astronomy, University of Southampton
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P.S.
Please close the previous question and open the new one
The very first question was opened 5 years ago