generate p p > mu+ vm [QCD] problems

Hi,

> 1. When I generate process p p > mu+ vm [QCD] , some of additional process is generated , which I needn't. For example the process that I don't want are : d~ u > mu+ vm g , d~ g > vm mu+ u~ ........ that process final state include three particle is unexpected process .

Actually those process are crucial in order to have the NLO accuracy. Those correspond to the real radiation and they cancel the singularity associated to the virtual contribution (the interference between the loop diagram and the born).

> 2. how can I set invariant mass of lepton cuts,both maximum minimum value of eta cuts and pt cuts while I am doing NLO calculation ?

Some of those cuts are available by default, you just have to edit the run_card.dat. For the other one, you have to implement them yourself in cuts.f.
(Be careful that your cut can spoil NLO accuracy and/or if too strong can make the code to not integrate correctly)

Cheers,

Olivier

> On 14 Jun 2017, at 12:44, Nijat <email address hidden> wrote:
>
> New question #643802 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/643802
>
> Dear experts ,
>
> 1. When I generate process p p > mu+ vm [QCD] , some of additional process is generated , which I needn't. For example the process that I don't want are : d~ u > mu+ vm g , d~ g > vm mu+ u~ ........ that process final state include three particle is unexpected process . I want to calculate the matrix which final state only include mu+ vm at NLO .
> How can I handle this problem ?
> please help me .
> 2. how can I set invariant mass of lepton cuts,both maximum minimum value of eta cuts and pt cuts while I am doing NLO calculation ?
>
>
>
> Best regards,
> Nijat
>
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