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Re: Eta_c efficiency [message #12827 is a reply to message #12809] Tue, 29 November 2011 14:43 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: *

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:
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
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:

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

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