Re: [ROOT] info on TParticle Object

From: Pasha Murat 630-840-8237@169G (630-840-8237@169G)
Date: Mon May 06 2002 - 17:26:50 MEST


this looks like a perfect question for some ALICE software mailing list.
ALICE folks: could you point Annalisa to the right list?
								-best, Pasha

On Mon, 06 May 2002 16:44:29 +0200 (CEST)
"Annalisa De Caro" <decaro@mail6.cern.ch> wrote:

>    Hi rooters,
> my problem is the definition of a primary particle.
> Until now, i selected (or i thought to select) the primary particles in
> the Hijing (Pb-Pb) events in this fashion:
>              GetFirstMother()<0
> (i find this selection type in the macro anal.C in the directory
> $ALICE_ROOT/macros);
> but with the same selection with Pythia generator (and proton-proton
> events) i did not found primary particles (that is, with
> GetFirstMother()<0), while i found particles with:
>             GetSecondMother()<0...
> My problem is the definition of a primary particle...
>       Thank you
>                        Annalisa
> 
> > Hi Annalisa - could you be a bit more explicit in your description of
> > the problem? -best, Pasha
> > 
> > On Fri, 03 May 2002 16:09:57 +0200 (CEST)
> > "Annalisa De Caro" <decaro@mail6.cern.ch> wrote:
> > 
> > >    Hi rooters,
> > > Can you help me to understand what is the physical means of these methods:
> > >    (Get/Set)FirstMother
> > >    (Get/Set)SecondMother
> > > which appartain to the TParticle class?
> > > I had the prolem to define a particle as primaries...
> > >    Thank you in advance
> > >                        Annalisa
> > 
> 



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