Defining a new particle in Madgraph

Hi,

>
> 1. In the second line above should I define the multiparticle x as define x = w+ w- ? i.e., Does presence or absence of the '=' sign make any difference to the process generated ?

No difference between those two syntaxes.

> 2. Or should I generate the desired process as follows :

This syntax is slightly less optimal since it forces us to keep track separately of each contribution and therefore the code created is slower and is bigger (more file written, total size bigger)

Cheers,

Olivier

> On 3 Jul 2017, at 20:04, Dibyashree Sengupta <email address hidden> wrote:
>
> New question #646022 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/646022
>
> Hi,
>
> I am trying to run a process p p > w+/- z in Madgraph. So, I thought of defining a new particle and generated this process in the following way :
>
> ./mg5_aMC
>
> define x w+ w-
>
> generate p p > x z
>
> My question is :
>
> 1. In the second line above should I define the multiparticle x as define x = w+ w- ? i.e., Does presence or absence of the '=' sign make any difference to the process generated ?
>
> 2. Or should I generate the desired process as follows :
>
> ./mg5_aMC
>
> generate p p > w+ z
>
> add process p p > w- z
>
> Thanks,
> Dibyashree.
>
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