MadGraph5_aMC@NLO

latest FR and UFO: New Model

Asked by Arian Abrahantes

Dear MG Team:

I am trying to implement a new model into MG5. I will try to follow the FR path. My lagrangian written looks like

gs \bar{t}\sigma^{\mu\nu}T^{a}(P_{L}+P_{R})u G^{a}_{\mu\nu}

in FR looks pretty much like this:

L = I/2 gs tbar.(Ga[\[Mu]].Ga[\[Nu]] - Ga[\[Nu]].Ga[\[Mu]]).T[
    a].(ProjM + ProjP).u FS[G, \[Mu], \[Nu], a]

Sort of effective ugt coupling (I have omitted constants on purpose). And it extends the MSSM model.

how ever when I load the MSSM FR model and add my lagrangian I get that UFO interface is not written even the MSSM model is not well exported. Has any of you had this kind of problem, I am using RF v1.6.5 and Mathematica v6.0 in Mac Intel.

any suggestion is appreciated,

best,

arian

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Arian Abrahantes
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Arian Abrahantes (arian-abrahantes) said : 		#1

Here I am supplying the couple of line I am using with the FR "First example" supplied. I am using the FR posted in the web page (Version: 1.6.5 ( 21 May 2012).) I will add bellow the lagrangian I am testing and a couple of checks that I get properly working (check hermiticity and select a vertex), unfortunately the UFO writing interface crashes as well, identical logs than previous post. Can any one confirm this? or get it working? thanks in advance

L = I/2 gs tbar.(Ga[\[Mu]].Ga[\[Nu]] - Ga[\[Nu]].Ga[\[Mu]]).T[
    a].(ProjM + ProjP).u G[ a]
L = L + HC[L]

CheckHermiticity[L, FlavorExpand -> True]

FeynmanRules[L, SelectParticles -> {{G, t, ubar}}]

WriteUFO[L]

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi Arian,

For that you should contact the Feynrules author.
Their website to their ticket system is here: https://feynrules.irmp.ucl.ac.be/

Cheers,

Olivier

Revision history for this message
Arian Abrahantes (arian-abrahantes) said : 		#3

Thanks Olivier:

I will contact them.

best,

arian