MadGraph5_aMC@NLO

polarization information in a process

Asked by coolpankaj007

Hi,

I intend to calculate cross section for the process pp->tW where t should have either + or - helicity. In the matrix1.f program in the subprocesses folder, I find the helicities of each particle is listed in data statement. I just commented all the postive helicity lines for top quark to calculate the cross section. Do you think that it is the correct way to do this?

Thanks
Pankaj

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Pankaj,

What you did (comment all the positive helicity) is not coherent with your intent (the t should have either + or - helicity).
But otherwise this is valid.

You have more information in this FAQ:
https://answers.launchpad.net/mg5amcnlo/+faq/2243

Cheers,

Olivier

On 16 Feb 2015, at 06:21, coolpankaj007 <email address hidden> wrote:

> New question #262176 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/262176
>
> Hi,
>
> I intend to calculate cross section for the process pp->tW where t should have either + or - helicity. In the matrix1.f program in the subprocesses folder, I find the helicities of each particle is listed in data statement. I just commented all the postive helicity lines for top quark to calculate the cross section. Do you think that it is the correct way to do this?
>
> Thanks
> Pankaj
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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