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Re: Crash in PndTpcRiemannTrackingTask [message #12259 is a reply to message #12192]

Thu, 14 July 2011 10:25

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

Attachment: n_charged_tpc.png
(Size: 10.59KB, Downloaded 232 times)
Attachment: m_etac_tpc.png
(Size: 10.80KB, Downloaded 207 times)
Attachment: m_etac_tpc_vtx.png
(Size: 10.78KB, Downloaded 202 times)

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[Message index]

		Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Mon, 04 July 2011 20:11
		Re: Crash in PndTpcRiemannTrackingTask By: Johannes Rauch on Tue, 05 July 2011 11:47
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Tue, 05 July 2011 12:56
		Re: Crash in PndTpcRiemannTrackingTask By: Johannes Rauch on Fri, 08 July 2011 13:14
		Re: Crash in PndTpcRiemannTrackingTask By: Johannes Rauch on Tue, 12 July 2011 16:56
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Sat, 16 July 2011 23:27
		Re: Crash in PndTpcRiemannTrackingTask By: Dima Melnychuk on Thu, 14 July 2011 10:25
		Re: Crash in PndTpcRiemannTrackingTask By: Johannes Rauch on Thu, 14 July 2011 10:53
		Re: Crash in PndTpcRiemannTrackingTask By: Dima Melnychuk on Thu, 14 July 2011 10:58
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Thu, 14 July 2011 11:06
		Re: Crash in PndTpcRiemannTrackingTask By: Dima Melnychuk on Sun, 17 July 2011 01:18
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Sun, 17 July 2011 10:05
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Sun, 17 July 2011 16:58
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Mon, 18 July 2011 09:59
		Re: Crash in PndTpcRiemannTrackingTask By: StefanoSpataro on Mon, 18 July 2011 14:46

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