Generate onshell and offshell intermediate bosons

Hi,

Your syntax includes both onshell and offshell Z.
So you seem to use the syntax that you are looking for.

Cheers,

Olivier

PS:
> h > z z > 4l
is actually the same as
> h > z > 4l

Since repeating multiple times the request of "at least one s-channel" will not have any impact

> On 5 Sep 2021, at 01:01, Aya Ismail Beshr <email address hidden> wrote:
>
> New question #698636 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/698636
>
> Dear MG experts,
>
>
> I am trying to generate the process: H > h h, h > b b~, h > z z > 4l , where H and h are heavy BSM and light SM higgs respectively. I am using 2HDM-typeI generated by SARAH.
>
> As mass of h ~ 125GeV & mass of Z ~ 91.3GeV, so the decay of h is: h > Z Z*, where Z is onshell with mass ~ 91.3 GeV and Z* is offshell with mass < 91.3 so both gives the invariant mass of h around 125 GeV.
>
> My question is, is it possible to generate such a decay with both onshell and offshell Z bosons? and if so could you kindly tell me the proper syntax for doing so?
>
>
>
> Thanks for your time!
> Aya
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Dear Olivier,

Thanks a lot! and sorry for my late reply, I had an issue with my account
and couldn't login.

I have tried the syntax h > z > 4l as you suggested, however I got diagrams
from other contributions rather than Z, so in order to get rid of them and
keep only that with Z, I did:

g g > h2 > h1 h1, h1 > b b~, (h1 > z > mu+ mu- mu+ mu- /ah2 mu+ mu-)

is there an issue here?

I also tried another syntax with the same result;

g g > h2 > h1 h1, h1 > b b~, (h1 > z mu+ mu- $z /ah2 mu+ mu-, z > mu+ mu-)

is this true?

Thanks a lot!
Aya

On Mon, Sep 6, 2021 at 9:30 AM Olivier Mattelaer <
<email address hidden>> wrote:

> Your question #698636 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/698636
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> Hi,
>
> Your syntax includes both onshell and offshell Z.
> So you seem to use the syntax that you are looking for.
>
> Cheers,
>
> Olivier
>
> PS:
> > h > z z > 4l
> is actually the same as
> > h > z > 4l
>
> Since repeating multiple times the request of "at least one s-channel"
> will not have any impact
>
>
> > On 5 Sep 2021, at 01:01, Aya Ismail Beshr <
> <email address hidden>> wrote:
> >
> > New question #698636 on MadGraph5_aMC@NLO:
> > https://answers.launchpad.net/mg5amcnlo/+question/698636
> >
> > Dear MG experts,
> >
> >
> > I am trying to generate the process: H > h h, h > b b~, h > z z > 4l ,
> where H and h are heavy BSM and light SM higgs respectively. I am using
> 2HDM-typeI generated by SARAH.
> >
> > As mass of h ~ 125GeV & mass of Z ~ 91.3GeV, so the decay of h is: h > Z
> Z*, where Z is onshell with mass ~ 91.3 GeV and Z* is offshell with mass <
> 91.3 so both gives the invariant mass of h around 125 GeV.
> >
> > My question is, is it possible to generate such a decay with both
> onshell and offshell Z bosons? and if so could you kindly tell me the
> proper syntax for doing so?
> >
> >
> >
> > Thanks for your time!
> > Aya
> >
> > --
> > You received this question notification because you are an answer
> > contact for MadGraph5_aMC@NLO.
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/mg5amcnlo/+question/698636/+confirm?answer_id=0
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/mg5amcnlo/+question/698636
>
> You received this question notification because you asked the question.
>

Hi,

Thanks for the clarification!

Aya

On Mon, Sep 13, 2021 at 1:25 PM Olivier Mattelaer <
<email address hidden>> wrote:

> Your question #698636 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/698636
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> Hi,
>
> Just the usual potential issue that you can arrive to a set of non gauge
> invariant set of Feynman Diagram when removing Feynman Diagram.
>
> The second syntax is also something that I'm worried about since you
> artificially break the symmetry between the muon which can lead to a
> wrong symmetry factor in some part of the phase-space.
>
> Cheers,
>
> Olivier
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/mg5amcnlo/+question/698636/+confirm?answer_id=2
>
> If you still need help, you can reply to this email or go to the
> following page to enter your feedback:
> https://answers.launchpad.net/mg5amcnlo/+question/698636
>
> You received this question notification because you asked the question.
>

Thanks Olivier Mattelaer, that solved my question.