Decay Information Being Discarded Warning

If you need a sub-decay, you need a paranthesis
If you need a sub-decay from a sub-decay you need two level of parenthesis
So I guess that the formula that you are looking for is
> generate p p > w2- h02, (w2- > t~ b, (t~ > w- b~, w- > j j))

Cheers,

Olivier

> On 7 Nov 2024, at 18:45, Daniel <email address hidden> wrote:
>
> New question #819294 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/819294
>
> Hi everyone,
>
> I'm currently trying to produce gridpacks using the process
>
> generate p p > w2- h02, w2- > t~ b, t~ > w- b~, w- > j j
>
> However, when running MadGraph5 this gives out the warning
>
> WARNING: Decay without corresponding particle in core process found.
> Decay information for particle(s) w+,t is discarded.
> Please check your process definition carefully.
> This warning usually means that you forgot parentheses in presence of subdecay.
> Example of correct syntax: p p > t t~, ( t > w+ b, w+ > l+ vl)
>
> I've tried these different combinations so far:
>
> generate p p > w2- h02, w2- > t~ b, (t~ > w- b~, w- > j j)
> generate p p > w2- h02, (w2- > t~ b, t~ > w- b~, w- > j j)
> generate p p > w2- h02, w2- > t~ b, (t > w+ b, w+ > j j)
> generate p p > w2- h02, (w2- > t~ b, t > w+ b, w+ > j j)
> generate p p > w2- h02, w2- > t~ b, (t~ > w- b~, t > w+ b, w+ > j j, w- > j j)
> generate p p > w2- h02, w2- > t~ b, w- > j j
>
> but they all give similar warnings. Could you tell me how should I rewrite my process to fix it?
>
> Thanks in advance for your help,
> Daniel
>
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