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Subject: Bb response at 22 GeV > Dear collaborator, > > I had made a mistake in generating the plots yeasterday. The Mult was not > #tubes hit but the Total #hits ie. approximately the multiplicity in the > detector. > For effeciency of the system though the Number of tubes hits matters. > The 3 attached plots shows > Tubes hit (L,R) > Hit distribution (L,R) > #hits vs impact parameter for 22 geV 0-15 22 0-1 and 200 0-15 (only 300 ev > ents) Thus when making cuts of Ntubes>=2 which I think is a must to discriimnate against background we will get a fairly small effeciency for collisions approximately 30-40% of events, and with a strong bias for b>=5-6 i.e only 15-20% of centrality will be fully effecient for the trigger. Thus it confirms the previous statement - it is not easy at such low energy .
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