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User name V. Sulkosky
Log entry time 15:17:55 on November 09, 2008
Entry number 247773
keyword=Pion Cuts in Left HRSFigure 1 shows a plot of the uncalibrated energy over momentum spectrum
from the pion rejector. The black line is without any additional cuts.
The red line has a cut on the gas Cerenkov sum below channel 100 to
select pions, and the blue line has cut on the gas Cerenkov sum above
channel 300 to select electrons.
Even though the pion rejector is not calibrated, pions and electrons are
still well separated in the pion rejector. A cut on E/p between 0.04 and
0.12 will yield mostly pions. A cut on E/p greater than 0.45 will yield
mostly electrons. Plus the gas cerenkov is in good shape, though the
calibration is not yet final.
I calculated E/P with the following expression:
"(L.prl1.e+L.prl2.e)/(2350*(1+L.tr.tg_dp))". I added cuts on the event
type (T3 or T5), required that the pion rejector had a hit in both layers
(L.prl1(2).asum_c>0) and a +/- 0.05 cut on delta.
A copy of this log entry has been emailed to: kalyan,xqian,ycwang,chiran,jiang,jpchen,camsonne
Energy over Momentum
