gluon splitting into ccbar pair

Dear Nijat,

> I want to calculate p p > w- c [QCD], I expect that MG@NLO pridction for this process
> do not include contributions from gluon splitting into a cc pair, but only contributions where
> the strange (or the down) quark couples to the W boson. How can I do for this propose?

I'm slightly confuse about the question.
Do you mean that you do not know how to do the above simulation or
you want to do the above but adding some contribution.

I you want to do what you descrive, here is the syntax:

import model loop_sm-c_mass
define p = p / c c~
define j = j / c c~
generate p p > w- c [QCD]
output PATH
launch PATH
set maxjetflavor 3

Note that you will also have some diagram with the up (obviously) but as you expect (and correctly).

If you want to include some additional gluon splitting for the c, then you need to have that particle massless (which is not compatible with your process definitions)
In other words, you can not do that at NLO precision.

Cheers,

Olivier

> On 13 Oct 2017, at 14:57, Nijat <email address hidden> wrote:
>
> New question #659388 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/659388
>
> Dear experts,
>
> I want to calculate p p > w- c [QCD], I expect that MG@NLO pridction for this process
> do not include contributions from gluon splitting into a cc pair, but only contributions where
> the strange (or the down) quark couples to the W boson. How can I do for this propose?
>
>
> Best regards,
> Nijat
>
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