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Forum: Hadronic Processes
Re: Question SUSY particles (Ben)
Re: None Re: SUSY particles (Marc Verderi)
Date: 19 Jul, 2007
From: Makoto Asai <Makoto Asai>

You may want to refer to "Physics 3" tutorial presentation at
the recent Geant4 tutorial at Paris.
http://geant4.in2p3.fr/2007/prog/prog.htm
In this presentation, slides 19 through 22 address to dealing
with exotic particles.

Please keep in mind that we do not guarantee our physics
processes are "correct" for such exotic particles. For example,
I don't think an R-hadron follows the ordinary ionization process.
It is too heavy so that it kicks out atoms rather than atomic
electrons. 

I understand there used to be a project in CMS to study 
physics processes for R-hadrons, but I do not know the 
current status.

Makoto

> -----Original Message-----
> From: Marc Verderi [mailto:verderi@in2p3.fr] 
> Sent: Thursday, July 19, 2007 5:08 AM
> To: publichypernews
> Subject: Re: SUSY particles
> 
> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <469F53FA.7030406@in2p3.fr>
>   Subject: ...change this to be about your reply.
> 
> Hi,
> 
> Geant4 knows to deal "only" with ordinary particles (observed ones).
> 
> I almost SUSY ignorant, so please forgive the obvious questions below.
> 
> Are R-hadrons stable ? If so, then the particle-matter 
> interactions for 
> such particles would need to be implemented. That would be 
> quite a work. 
> Presumably, this will depend on the model(s), and as such, Geant4 can 
> not provide the variety of models.
> 
> If they are unstable, with a lifetime that would not allow 
> the particle 
> to reach the first detector elements, then this would 
> correspond to the 
> typical use case of a generator, that will take care to decay the 
> R-hadron, according to SUSY physics, into ordinary particles, 
> that will 
> be passed for tracking to Geant4.
> For such generators, CMS experts will certainly help.
> 
> Cheers,
> Marc
> 
> Ben a écrit :
> > *** Discussion title: Hadronic Processes
> > Email replies to PublicHyperNews@slac.stanford.edu must include:
> >   In-Reply-To: <"/hadronprocess/741"@geant4-hn.slac.stanford.edu>
> >   Subject: ...change this to be about your reply.
> >
> > Hi
> >
> > I'm trying to simulate the passage of SUSY particles (specificlly
> > R-Hadrons) though the CMS detector - geant doesnt seem to 
> know what to
> > do with them and I notice they dont have definitions in the 
> particles
> > directory. Can anyone advise on where additions to the 
> source code would
> > need to be made in order to take account of these extra particles?
> >
> > Many Thanks,
> >
> > Ben Jones [Bristol]
> >   
> 
> 

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