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Re: Eta_c efficiency [message #12827 is a reply to message #12809]

Tue, 29 November 2011 14:43

Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...

first-grade participant

From: *fuw.edu.pl

Hi,

With the latest STT reconstruction update the following results are obtained for eta_c channel with data produced on grid.

run926 (99500 events, copy of one file (500 events) fails)
Invariant mass distribution:
index.php?t=getfile&id=6732&private=0

Reconstruction efficiency - 25.8%, result is good but again somehow lower than I obtained with 1000 events (30.9%)
sigma(eta_c)=31.6 MeV, sigma(phi)=3.87 MeV

With cleanup - run926cu
index.php?t=getfile&id=6733&private=0

Efficiency drops to 18.1%, but still is reasonable.
sigma(eta_c)=28.7 MeV, sigma(phi)=3.70 MeV

And here are the multiplicities of charged tracks, without and with cleanup:
index.php?t=getfile&id=6734&private=0

So I still try to understand why on grid efficiency is lower than I have locally, but otherwise data look reasonable.

Dima

Attachment: mfinal_926.png
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Attachment: mfinal_926cu.png
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Attachment: n_charged926.png
(Size: 10.72KB, Downloaded 907 times)
Attachment: n_charged926cu.png
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[Message index]

		Eta_c efficiency By: Gianluigi Boca on Fri, 25 November 2011 19:20
		Re: Eta_c efficiency By: Dima Melnychuk on Sun, 27 November 2011 23:27
		Re: Eta_c efficiency By: Dima Melnychuk on Mon, 28 November 2011 12:43
		Re: Eta_c efficiency By: StefanoSpataro on Mon, 28 November 2011 16:05
		Re: Eta_c efficiency By: Dima Melnychuk on Mon, 28 November 2011 17:14
		Re: Eta_c efficiency By: StefanoSpataro on Mon, 28 November 2011 17:43
		Re: Eta_c efficiency By: Dima Melnychuk on Tue, 29 November 2011 14:43
		Re: Eta_c efficiency By: Gianluigi Boca on Tue, 29 November 2011 15:42
		Re: Eta_c efficiency By: StefanoSpataro on Tue, 29 November 2011 15:54

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