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Date: Sun, 19 Mar 95 21:00:06 -0500
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From: akiba@sgs0.hirg.bnl.gov (Yasuyuki Akiba)
To: Multiple recipients of list <phenix-comp-l@bnl.gov>
Subject: Re: PISORP2.04 release; new Electron-ID simulation (Billion event scenario)

Dear Charlie;
I have a comment on your billion event scenario. I think it is acceptable
200 pi0 events and 200 pi+ events to produce 40,000 events equivalent for
electron signles PID simulation. However, it is pushing things too far to
mix this 40000 events again to produce 1.6 Billion event equivalent for
mass spectrum. Note that the most of tracks that are identified as
"electron" are in fact real electrons from gamma conversions and pi0
Dalitz decays. There is relatively small fraction of mis-identified pions
due to track overlapping, etc. Therefore, you can produce combinatorial
mass background at most 200x200=40000 events from 200 pi0 events. For example,
in order to produce very high mass e+e- pair, you need e+ and e-, both of
them having verly large pt. But, there is very small number of Dalitz e+ or e-
with, say , pt>1GeV/c, in 200 pi0 events. Suppose there is none of them.
Then, you can never produce e+e- pair with Mee > 2 GeV from the combination
of those Dalitz e+/e-, no matter how many times you combine them. But, there
should be a very large number of Dalitz e+e- pairs with M>2GeV in 1.6
billion Au+Au central collisions.
Regards,
								Y. Akiba




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