Matching plots not smooth

Hi,

In showerkt matching qcut should always be larger than xqcut.
According to the plot that you show, the xqcut value that you use is much too large, which is not surprising for diphoton.
I would try with something around
xqcut = 10
qcut =20

Cheers,

Olivier

On Jul 3, 2014, at 6:02 PM, Ralph Edezhath <email address hidden> wrote:

> New question #251177 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/251177
>
> Hi,
> I've been trying to generate matches samples for diphoton+0,1,2 jets. The matching plots are not smooth (this is what I get http://i61.tinypic.com/5apete.jpg ). What are the correct settings to use in MG5 and Pythia?
>
> This is what I've been using besides the default settings:
>
> 1= ickkw
> 50=xqcut
> 5 = maxjetflavor (also b b~ in j, p definitions)
>
> QCUT = 50 (tried varying from 40 to 200)
> SHOWERKT=T
> MINJETS=0
> MAXJETS=2
>
> thanks,
> Ralph
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Thanks Olivier, that works!

Is there a straightforward to get the right xqcut value for a particular process or is it through trial and error?

It is basically trial and error.

you have some guidelines here:
https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/IntroMatching

Cheers,

Olivier

On Jul 7, 2014, at 11:16 PM, Ralph Edezhath <email address hidden> wrote:

> Question #251177 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/251177
>
> Ralph Edezhath posted a new comment:
> Thanks Olivier, that works!
>
> Is there a straightforward to get the right xqcut value for a particular
> process or is it through trial and error?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.