MadGraph5_aMC@NLO

default cut on drll

Asked by Renjie Wang

Dear expert,

I am wondering why a default cut on the distance of dilepton is placed: drll>0.4
do we have a specific reason for that?

Thanks;
Ren-Jie

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

We can’t put it to zero by default, otherwise you are sensitive to the collinear divergencies from the photon to dilepton diagram.

Cheers,

Olivier

On Jun 20, 2014, at 8:51 PM, Renjie Wang <email address hidden> wrote:

> New question #250524 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/250524
>
> Dear expert,
>
> I am wondering why a default cut on the distance of dilepton is placed: drll>0.4
> do we have a specific reason for that?
>
> Thanks;
> Ren-Jie
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Renjie Wang (r-jiewang) said : 		#2

Hi Olivier,

Thanks for your answer, that is what I guess.

Cheers;
Ren-Jie