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Re: Update on eta_c reconstruction with STT and TPC [message #12404 is a reply to message #12402] Sat, 30 July 2011 15:34 Go to previous messageGo to previous message
Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino
first-grade participant

From: *21-151.libero.it
Quote:

Looking on the number of counts in eta_c peak with 80 vs 8000, I can add that number of analysed events is 2000 vs 100k. So drop of efficiency by factor 2 appears already on this level.

And concerning the error at lower statistics (calculating it as a square root of number of reconstructed eta_c) it' about 1%, i.e. 15+/-1 % vs 23%. So the numbers are not really compatible within errors, (may be it's just a matter of fluctuation).

Hi Dima,
you are right, considering these numbers I am also wondering if it is really just statistics. Let' s see what happens with more events.
Cheers,
Lia.

 
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