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User name R. Michaels
Log entry time 04:46:03 on November 6,2009
Entry number 297716
This entry is a followup to: 297714
keyword=Qsq distributionQsq was measured on L-HRS only. R-HRS is still not operational.
The best trigger is T1 = S1.and.S2.
All others should be prescaled away for this job.
From run 25250 we get the distribution in fig 1 for the first
200K events. The shape looks ok and the average agrees
with expectation:
Qsq = 2*E*E'*(1-cos(theta)) = 1.12 GeV^2
for
E = 6.07 GeV
E' = 3.66 GeV
theta = 12.9 degrees
It's a good start.
Later we need to know the angle error, get good database (matrix
elements), study rate effects, and so on.
FIGURE 1
