Interactions violating the charge

[lichuang]

Dear Florian,

I used SARAH's command MakeUFO to generate the UFO files of model 331-v2, then I started up MadGraph 2.5.4, run the following command:

MG5_aMC>import model 331v2 -modelname
INFO: load particles
INFO: load vertices
INFO: The model has interaction violating the charge: charge
Kept definitions of multiparticles l- / j / vl / l+ / p / vl~ unchanged
Defined multiparticle all = g a nu1 nu2 nu3 nu1bar nu2bar nu3bar ft d1 d2 d3 fdd1 fdd2 u1 u2 u3 ftbar d1bar d2bar d3bar fdd1bar fdd2bar u1bar u2bar u3bar h1 h2 h3 ah3 hpm3c hpm4c dpm2c z zp wp xp ypp hpm3 hpm4 dpm2 wpc xpc yppc e1 e2 e3 fee1 fee2 fee3 e1bar e2bar e3bar fee1bar fee2bar fee3bar

Is this info "The model has interaction violating the charge: charge" a big problem?

If it is a problem, where does it come from? MadGraph or UFO files? (Sure, MadGraph team has told me it's a problem of the UFO model files)

Do you have any clue to resolve this problem?

Thanks!

[FStaub]

Hi,

I wouldn't just ignore it.
There can be three reasons:

1) A ill-defined model
2) Wrong definition of electric charged in particles.m
3) It's not obvious from the analytical expression that a charge violating vertex vanished, but once the (consistent) numerical values are plugged in, it does.

Does MG tell you which vertex has the problem? I think that's written in the log file. However, I will bet on 2) looking at your other question.

Cheers,
Florian

[lichuang]

Thanks for your reply.
I can't find detailed debug info of MG.
Maybe I should ask MG team to offer.
Best Wishes!