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VPDMB purity check and vertex position check for pAu 200 GeV

Updated on Thu, 2015-05-07 09:35. Originally created by dongx on 2015-05-07 09:35.

 

run# 16125048
vz correlation betwen TPC and VPD
Vz_TPC after the correlation cut
  sigma = 6.32 +/- 0.05 cm
Vx, Vy positions
  vx_mean = 0.096 +/- 0.009 cm
  vy_mean = -0.272 +/- 0.009 cm

With the 6.3cm beam Vz distribution, the fraction of the events within (-5,5) cm is 57.2%, and 65.9% within (-6,6) cm.

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