[Rivet] hepmc analysis - rivet

[Holger Schulz]

On 09/10/13 15:54, Miroslav Myska wrote:
> Hi Holger,
>
> thanks a lot!
> This is exactly I am going to do
> (plus analyse outgoing parton pT)
>
> At the first sight, it is strange to see, why the MPI
> vertex has to be 2->2. It can not be 2->1 ?
>
>  if (npin ==  npartin && npout == npartout && npin == 2 && npartin ==
> npartout) MPIvertices++;
>
>
This is at least true for Sherpa where MPI scatters are only modelled as
2->2 scatters.
MPI scatters are one of these things where there is no generator independent
way of getting these quantities, hence you need to check how to identify
MPI scatters in H++.

Ahoj,
Holger

> Thank you both very much,
> best wishes
> Miro

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