R-parity violating MSSM

Hi,

Did you look at this:
https://feynrules.irmp.ucl.ac.be/wiki/RPVMSSM#no1

Cheers,

Olivier

On Jul 3, 2013, at 9:21 PM, Christopher A. George <email address hidden> wrote:

> New question #231847 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/231847
>
> I need to generate an R-parity violating process. If I do this using mssm, I get the warning about 0 cross-section. I found a RPVMSSM_MG package somewhere online, and tried to invoke it with import model_v4 -modelname RPVMSSM_MG, but when I launch, I get a huge compiling error. Is there any good way to do this?
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Thanks, but that is actually what I tried. I downloaded af1_mg.tgz and untarred it; the result is a model file called RPVMSSM_MG. Then I did:

import model_v4 -modelname RPVMSSM_MG

This all works great, but when I generate events, it gives me a huge compilation error.

I would then advise you to use the
UFO model rather than the v4 model.

> This all works great, but when I generate events, it gives me a huge
> compilation error.

The fortran compilator is often hardcoded in v4 model (often to f77).
So you need to ensure that the model use the same compilator that the rest of the code.
Except if gfortran is not installed on your machine, MG5 will use gfortran for the compilation.
This is probably the reason why your code didn't compile.

Cheers,

Olivier

On Jul 3, 2013, at 10:41 PM, Christopher A. George <email address hidden> wrote:

> Question #231847 on MadGraph5 changed:
> https://answers.launchpad.net/madgraph5/+question/231847
>
> Status: Answered => Open
>
> Christopher A. George is still having a problem:
> Thanks, but that is actually what I tried. I downloaded af1_mg.tgz and
> untarred it; the result is a model file called RPVMSSM_MG. Then I did:
>
> import model_v4 -modelname RPVMSSM_MG
>
> This all works great, but when I generate events, it gives me a huge
> compilation error.
>
> --
> You received this question notification because you are a member of
> MadTeam, which is an answer contact for MadGraph5.

Thanks again for this. That did actually work; the ufo code did compile. But, now I get the same result that I got when I tried to do this in the mssm:

"Survey return zero cross section.
   Typical reasons are the following:
   1) A massive s-channel particle has a width set to zero.
   2) The pdf are zero for at least one of the initial state particles
      or you are using maxjetflavor=4 for initial state b:s.
   3) The cuts are too strong.
   Please check/correct your param_card and/or your run_card."

The process I'm running is t1 t1~ > b b~ mu+ mu-. I also tried changing maxjetflavor to 6, no change.

YES! That was the problem, thanks much for all your help.

Thanks Olivier Mattelaer, that solved my question.