[Primexd] eta yield per number of events

[Ilya Larin]

 Hi Ashot

below is my estimation of the numbers of etas as you asked
and event selection for them.

 Ilya


He runs with the new beam energy and w/o CDC:
61465 61468 61469 61470 61471 61472 61473 61474 61475 61476 61477 61478 61479 61480 61481 61482.
The total number of events according to Sasha 2.307B.
Total run time (most of the time beam on) 27.5hr

The number of etas:
(3 FCAL outer/inner layers excluded)

Eg>1 & Egg>6  264.4K+/-1.3K
Eg>1 & Egg>9   23.1K+/-0.3K

Number of exclusive etas:
(3 FCAL outer/inner layers excluded,
 |Egg-Ebeam|<2, |Cluster1_time-Cluster2_time|<3.5,
 15<(Cluster1_time+Cluster2_time)/2-beam_time<24,
 |rf_time-beam_time|<2)

Eg>0.5 & Egg>6  8307+/-267
Eg>0.5 & Egg>9  3285+/-146


Thus per 1B events, we have
3.6K+/-0.11K exclusive eta (Eg 0.5/Egg 6)
1.4K+/-0.06K exclusive eta (Eg 0.5/Egg 9)



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