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