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User name jpchen
Log entry time 21:33:38 on March 3,2009
Entry number 264398
keyword=LHRS trigger rates + vs -.LHRS rates comparison:
Run 20479, 50.8 Hz/10.0 uA, negative polarity.
Run 20502, 368.7 Hz/12.1 uA, positive polarity.
It is about a factor of 6, which is consistent with my wave-hand guesstimation: the rates are dominated by pions + proton.
pi+ is about a factor 3-4 more than pi-, proton is at the same levle as pions (1/2-1/4 of pi+), (plus smaller amount of e+e- pair from pi0 decay). This gives positive trigger to be about a factor of 4-6 of negative trigger.
FIGURE 1
FIGURE 2
