Difference between revisions of "August 9, 2016, Analysis Working Group"

Revision as of 15:25, 9 August 2016

The meeting will be on Tuesday August 9, 2016 at 1:30 pm EDT. For those people at Jefferson Lab, the meeting will be in room A110.

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Analysis Launch ~85% complete
SC Efficiencies: No update, Mahmoud at Gordon Conference
CDC Efficiencies: Mike showed that the # of low-efficiency channels is consistent throughout the run, will add to MC soon.
FDC Efficiencies (Alex):
- The improvements in the track reconstruction have corresponded to improvements in the FDC pseudo-hit efficiencies. They are now roughly ~90% in the healthy regions of the detector.
- For tracks that pass near the wires in the FDC, the hits are often not reconstructed. However, they were picked up before the latest changes to the tracking, so it may be an issue with the timing calibration.
Tracking (Paul):
- The missing mass vs beam energy distributions (for all topologies) have a sharp change near 4.2 GeV. This indicates an inconsistency with the TAGH beam energies. Nathan will look into it.
  - The other irregularities in these plots may be due to not subtracting the accidentals. Paul will try this next time.
- Paul showed tracking resolutions, but they are topology dependent: The resolutions are computed by comparing the reconstructed momentum to the missing momentum, and the missing momentum is topology-dependent. It will take some work to deconvolve the contributions to the resolution from the missing momentum.
- To compute the tracking efficiencies, the sideband subtraction is proving difficult, and is not ready yet.
FCAL Neutral Efficiencies: Jon is having some issues with large backgrounds at low energies, and is working on improvements.

@@ Line 33: / Line 33: @@
 * Tracking (Paul):
 ** The missing mass vs beam energy distributions (for all topologies) have a sharp change near 4.2 GeV. This indicates an inconsistency with the TAGH beam energies. Nathan will look into it.
+*** The other irregularities in these plots may be due to not subtracting the accidentals. Paul will try this next time.
 ** Paul showed tracking resolutions, but they are topology dependent: The resolutions are computed by comparing the reconstructed momentum to the missing momentum, and the missing momentum is topology-dependent. It will take some work to deconvolve the contributions to the resolution from the missing momentum.
 ** To compute the tracking efficiencies, the sideband subtraction is proving difficult, and is not ready yet.
 * FCAL Neutral Efficiencies: Jon is having some issues with large backgrounds at low energies, and is working on improvements.