MadGraph5_aMC@NLO

jet matching

Asked by Siddharth

Hi,
       I am trying to study the process p p > l+ l- j j , which, via mistagging of light jets, can serve as a background to the signal

p p > z h, z > l+ l- , h > b b~. To calculate the cross section for this background, i am confused whether I should just calculate the

cross section for

 p p > l+ l- j j , or calculate the matched cross section for :

1 ) p p > l+ l- j j @1

2) p p > l+ l- j j j @ 2.

At the level of the analysis , i am identifying my final state as comprising of exactly 2 jets and 2 leptons.

It would be kind of you to help with the correct syntax regarding the same.

thanks
Siddharth

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

This is an analysis statement, so they are no easy answer for this question.
The safest is certainly to use the matched/merged method. Since this can not bias your generation.
The worst case is that your analysis will discard all the events coming from the 3j multiplicity (at parton-level).

Cheers,

Olivier

> On Feb 11, 2016, at 10:17, Siddharth <email address hidden> wrote:
>
> New question #285033 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/285033
>
> Hi,
> I am trying to study the process p p > l+ l- j j , which, via mistagging of light jets, can serve as a background to the signal
>
> p p > z h, z > l+ l- , h > b b~. To calculate the cross section for this background, i am confused whether I should just calculate the
>
> cross section for
>
> p p > l+ l- j j , or calculate the matched cross section for :
>
> 1 ) p p > l+ l- j j @1
>
> 2) p p > l+ l- j j j @ 2.
>
> At the level of the analysis , i am identifying my final state as comprising of exactly 2 jets and 2 leptons.
>
> It would be kind of you to help with the correct syntax regarding the same.
>
> thanks
> Siddharth
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
Siddharth (dwivedi-siddharth) said : 		#2

Thanks Olivier Mattelaer, that solved my question.