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Re: Multipion with Event Mixing [message #12857 is a reply to message #12854] Mon, 12 December 2011 10:45 Go to previous message
Elisa Fioravanti is currently offline  Elisa Fioravanti
Messages: 84
Registered: January 2008
continuous participant
From: *fe.infn.it
Hello everybody,

here you can find the results also of pi+pi-pi+pi- with event mixing.
I reported both pi+pi- and 2(pi+pi-) channel.

As you can see in slide number 11, for the invariant mass of the four pions, the background level is huge, and so I think that one solution could be to fit the distribution with a gaussian function plus a polynomial function in order to take into account the background level.
In this way I calculated the efficiency as number of signal events/ number of generated events, and the result is 13% against 30% without event mixing.

For the two pions channel we have a drop in efficiency from 69% to 60%.

Elisa
 
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