GSI Forum
GSI Helmholtzzentrum für Schwerionenforschung

Home » PANDA » PandaRoot » Bugs, Fixes, Releases » Crash in PndTpcRiemannTrackingTask
Re: Crash in PndTpcRiemannTrackingTask [message #12259 is a reply to message #12192] Thu, 14 July 2011 10:25 Go to previous messageGo to previous message
Dima Melnychuk is currently offline  Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...
first-grade participant
From: *fuw.edu.pl
Hi,

I checked TPC performance for eta_c reconstruction after latest update of PndTpcRiemannTrackingTask.

I used kaon hypothesis in tpc reconstruction macro

tpcSPR->SetPDG(321);
tpcSPR->SetMCPid(false);

and eta_c peak appeared back but efficiency is still low in comparison with STT (5.4-5.9% for TPC vs 20-29% for STT).

So with 2000 events multiplicity of charged tracks:
index.php?t=getfile&id=6505&private=0
And maximum efficiency we can expect is 54%.

Mass distribution for phi and eta_c (using 4C-fit) efficiency - 5.9%
index.php?t=getfile&id=6506&private=0

Mass distribution for phi and eta_c (using vertex fit) efficiency - 5.4%
index.php?t=getfile&id=6507&private=0

Efficiencies in principle depend on cuts on chi2 of the fit and can be increased, but the 4-times difference between TPC and STT is with the same cuts.

Dima

 
Read Message icon4.gif
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: source of low efficiency of eta_c reconstruction with TPC
Next Topic: Number of entries in TTree
Goto Forum:
  


Current Time: Thu Dec 09 01:34:09 CET 2021

Total time taken to generate the page: 0.02574 seconds