> On Thu, 12 Sep 2002, Ian Bearden wrote:
>
> > Hi Deviants,
> > We'd like to take a look a couple of things in the p+p data, in
particular
> > we'd like to check the pbar/p ratio to see whether the ultra
preliminary
> > BRAHMS result of 0.8 is correct or if the PHENIX 0.6 value is
reasonable.
> > We are looking at the DSTs made by Kris (thanks!) I have a couple of
> > questions:
> > 1. Do I recall correctly that only H2 has been calibrated?
> > 2. How does one get a 'reasonable' collision vertex...or is it not
possible.
>
>
> Why not using the cluster vertex (Bjrn) or track vertex (JH) ?
I doubt if there's enough statistics in TPM1 to do this for pp. For a
certain class of events you can probably do it, but you'll bias your
data sample in strange ways. There two classes are, alas, mostly useful
for calibrations and double-checkings.
On the other hand, I've never tried them with pp data so who knows.
Ping :-)
--
Bjorn H. Samset Phone: 22856465/92051998
PhD student, heavy ion physics Adr: Schouterrassen 6
Inst. of Physics, University of Oslo 0573 Oslo
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