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User name horn
Log entry time 06:37:47 on July 10,2004
Entry number 478
keyword=Data-MC ratio: H(e,e'p) - prelim
Elastic H(e,e'p) data was taken at four beam energies during fpi2. The kinematic settings are listed below. The data was normalized by the effective charge, where the efficiency was calculated from the fid tracking efficiency, cpu and electronic lifetime. The following cuts were applied to the data:
HMS:
hcer_npe<1.0
abs(hsdelta)<8,5
abs(W-mp)<0.1
abs(hsxptar)<0.09
abs(hsyptar)<0.05
SOS:
scer_npe>0.5
abs(ssdelta)<15
abs(ssxptar)<0.04
abs(ssyptar)<0.08
Ebeam pSOS thetSOS pHMS thetHMS
4.2 -1.5808 51.00 +3.442 20.90
5.2 -1.74 50.01 +4.335 18.00
3.8 -1.4196 54.00 +3.154 21.40
4.7 -1.74 48.00 +3.7759 20.50
From the ratio of the data to monte carlo yields it can be observed that the ratio is systematically high for all four settings, which is currently investigated. Note that the error bars shown are statistical only.
Fig 1: H(e,e'p)
H(e,e'p) data-mc