[BLAST_ANAWARE] beta mystery solved?

From: Peter Karpius (karpiusp@einstein.unh.edu)
Date: Mon Sep 06 2004 - 20:06:00 EDT

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Hi Folks-

        For those of you looking at the plots I have posted on my website
- I had, for a while, a question about beta. Essentially, the blob we
thought were pions (with low ADC and short TOF->NC flight times) actually
had values for beta peaking down around 0.2 or so. We are expecting them
up near 0.8-0.9 - so this was a problem.

        Well I thnk it comes down to forcing the PID to be a proton. For
a beta of 0.85 we should expect a momentum of 0.224 GeV/c or so for a
pion. If we measure a momentum of 0.224 GeV/c and then force the mass to
be .938 GeV/c^2 we end up with a beta near 0.23.

This is shown in some new plots at:

http://einstein.unh.edu/~karpiusp/photodisProtPion.htm

Please take a look and comment on these plots. I will be working on this
more tonight on shift- Thanks!

Pete

----------------------------------------------
Pete Karpius
Graduate Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1220
FAX: (603)862-2998
email: karpiusp@einstein.unh.edu
http://pubpages.unh.edu/~pkarpius/homepage.htm
----------------------------------------------

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In reply to: Peter Karpius: "[BLAST_ANAWARE] Deuteron Photodisintegration Meeting Minutes"
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