[Halld-offline] event sizes and hit multiplicities

[Alexander Somov]

Hello Richard,

For most subdetectors the multiplicities seems to be consistent
with that listed in the GlueX-1043 note. Hadronic events in this
note were required to be accepted by the Level-1 trigger.

For the FDC, we obtained N ~ 450 hits for Egamma > 8 GeV and
N ~ 300 hits for Egamma < 8 GeV (note most low-energy hadronic
events below 3 GeV are rejected by Level-1).

Some discrepancies can probably be accounted for possible differences
in the  FDC geometry (strips splittes around the beamline) and
bg hit  treatment (+ the trigger bias).

Cheers,
        Sascha




On Mon, 1 Nov 2010, Richard Jones wrote:

> Colleagues,
>
> As requested, I reran the event size statistics collector and recorded hit 
> multiplicities in addition to byte counts on each subevent in the hddm record 
> for pythia minimum bias Monte Carlo.  The results are in the same place.
>
> http://zeus.phys.uconn.edu/halld/hdgeant/sizes-10-2010
>
> I have also broken out the different components of the fdc, and several other 
> detectors as well.  You can see that the major contribution comes from the 
> cathode strips whose multiplicity is almost 500 per event, on average.
>
> -Richard J.
>
>