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eta_c with event mixing for STT [message #12584] Tue, 30 August 2011 00:35 Go to previous message
Dima Melnychuk is currently offline  Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...
first-grade participant
From: *play-internet.pl
Dear colleagues,

I have analaised the eta_c data produced on the GRID with event mixing, and at the moment I still do not understand the results.

But I just want to share some plots to show the current status.

So multiplicity of charged tracks:

index.php?t=getfile&id=6599&private=0

Only 8% of events have >=4 tracks which is much lower than 72% without event mixing.

Invariant mass of phi and eta_c with preselection on phi mass window:

index.php?t=getfile&id=6600&private=0

Here there is no indication of phi or eta_c peak.

And aplying MC Truth PID does not change this distribution much.

And finaly only 4 events out of 100k pass the selection cuts.

So the results still have to be understood.

Dima

 
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