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User name yuan
Log entry time 09:03:54 on March 13,2000
Entry number 23169
Followups:
keyword=Improved Kaon coincidence spectrum
Using sato and yamaguchi's new enge hodoscope pulse height correction, analysed 7 CH2 runs( 31635-31641). got much better Kaon coincidence time spectum (fig. 2). background was very much reduced (compared with hclog entry# 22971).
Fig 1 shows the SOS beta(tof)-beta(k) vs. coincidence time. we can see the rf sructure for kaon at beta(tof)-beta(k) around 0. The real coincidence for pion,
kaon and protons are at around -36.5, -39.7, -44.6 respectively.
The cut conditions for kaons :
Dave Mack's collimator cut;
ssbeta-beta(k)>-0.05;
33
ssshtrk<0.75.and.scer_npe<13..and.saer_npe<1.6.and.sluc_npe>1.6
More statistics is needed to get cleaner kaon spectrum.
FIGURE 1
FIGURE 2