[Halld-offline] bggen

[Eugene Chudakov]

The PYTHIA record in the hdds format contains all the information
to decode the event. For every entry in the record there are:

1) PYTHIA entry number

2) Code (=1 - proceed to GEANT)

3) PDG flag (say 221 - eta)

4) GEANT particle type (or 0 if not defined in GEANT)

5) the parent number (see 1)), or 0 if the entry corresponds to the primary interation

BTW, in a sample of 400k simulated events I found about 60k eta and 10k eta' particles.

Eugene

On Tue, 10 Sep 2013, Beni Zihlmann wrote:

> Hi Kei,
>
> I comitted a small modification in pythia to change the output
> behavior.  Try
> it out now. It should prevent the output of colored objects as well as
> neutrinos.
> They may clear out some of the unwanted stuff but probably not all.
>
> cheers,
> Beni
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