[Primexd] [Revised Logentry] Accidentals in tagger, Be target

[somov at jlab.org]

Logentry Text:
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Some quick (rough) estimates of the fraction of accidental hits in the tagger (denoted as bg/sig in Fig. 2).

1. Consider PS trigger. Search for hits in the tagger around the PS energy in the window +- 1 GeV

2. Count number of hits correlated with the trigger time (signal). Determine accidentals
from the side band of the time distribution (see Fig. 1). Subtract accidentals

3. Fig. 2: fraction of accidental hits (in a  +- 1 GeV energy window) in the tagger as a function of the tagger energy

I'll  check it later, just scratched the surface now.



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