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Re: eta_c reconstruction efficiency [message #12704 is a reply to message #12702] Fri, 07 October 2011 11:19 Go to previous messageGo to previous message
Lia Lavezzi
Messages: 291
Registered: May 2007
Location: Torino
first-grade participant

From: *pv.infn.it
Hi Dima,
I performed some test with the etac channel, both in july11 and aug11 releases.

I can confirm that the problem of the efficiency loss arises already after the reconstruction, so after the PR + Kalman step.

I attach here two files with the reco - MC momentum distributions for the primary tracks coming from etac: etacjul11.pdf and etacaug11.pdf. You can see that in aug11 there is the efficiency drop.

Unfortunately this was not visible with box generated muons @ 1 GeV/c (see boxgenjul11.pdf and boxgenaug11.pdf attached here).

So indeed the problem seems in the tracking part (I have to take back what I said at the last tracking EVO Sad)

Ciao,
Lia.

P.S.: forgot to mention: the purple number on the histos is the integral of the histo between the two dotted lines.

[Updated on: Fri, 07 October 2011 11:21]

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