Difference between revisions of "April 11, 2011 (11:30AM), Physics Working Group"

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(Agenda)
 
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== Minutes ==
 
== Minutes ==
 +
 +
* Grid issues, reconstruction, and PWA of pi+pi+pi-n (Jake Bennett)
 +
 +
-- Jake and Richard have now been able to generate and reconstruct 20 million minimum bias events on the grid. 
 +
 +
-- Richard has a list of ~5 issues that he found in the reconstruction code that need to be fixed.  He will investigate and report on them soon. 
 +
 +
-- Richard expects to have 100TB of disk space on the grid in the next 6 months or so.
 +
 +
-- 20 million minimum bias events corresponds to roughly 5 minutes of data taking.  There was some discussion of how this effort will scale to larger data sets.
 +
 +
* Particle ID and tracking issues using the particle gun (Kei Moriya)
 +
 +
-- Kei presented an overview of the Kalman Filtering technique.
 +
 +
-- There was an unresolved question concerning whether the best chi2 to report is after the initial filtering stage or after the smoothing stage.
 +
 +
* Analysis of b1pi (Igor Senderovich)
 +
 +
-- Igor is working on an omega pi pi generator using the IU 3pi generator as a template.
 +
 +
* Kinematic fitting in b1pi (Will Levine)
 +
 +
-- Will is looking at pulls from kinematic fits.  It doesn't look like a simple scaling of errors will be enough to correct the pulls.  He is currently isolating tracks from different regions of the detector.
 +
 +
* Simulations of cascade baryons (Nathan Sparks)
 +
 +
-- Nathan has found a number of poorly reconstructed tracks with fairly high momentum (1 GeV), and will send a file to David and Simon for diagnostics.
 +
 +
-- Nathan is attempting to reincorporate the Cerenkov detector into the simulation.  Richard will help resurrect the code, which is based on a design Eugene presented a few years ago.
 +
 +
* Analysis of gamma p --> eta pi0 p (Irina Semenova and Andrei Semenov)
 +
* Tracking update (simon)
 +
 +
-- Simon presented an update on the tracking code.  The residuals (especially in the transverse vertex positions) seem to be a little off.  It's still under investigation.
 +
 +
-- The calib package was updated to fix a bug in pedestals, which led to a class of tracks having unrealistically large fitting probabilities.

Latest revision as of 17:27, 11 April 2011

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1. ESNET: 85-42553 (85-HALLD)

2. An EVO room under GlueX will be reserved

3. Phone:

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  • +1-303-248-0285 : International
  • then enter participant code: 3421244# (remember the "#"). Phone connection only upon request.
  • or www.readytalk.com (and code without the #)

Agenda

  1. status of physics analyses
    • Grid issues, reconstruction, and PWA of pi+pi+pi-n (Jake Bennett)
    • Particle ID and tracking issues using the particle gun pdf(Kei Moriya)
    • Analysis of b1pi (Igor Senderovich)
    • Kinematic fitting in b1pi (Will Levine)
    • Simulations of cascade baryons (Nathan Sparks)
    • Analysis of gamma p --> eta pi0 p (Irina Semenova and Andrei Semenov)
  2. Tracking update (simon)

Minutes

  • Grid issues, reconstruction, and PWA of pi+pi+pi-n (Jake Bennett)

-- Jake and Richard have now been able to generate and reconstruct 20 million minimum bias events on the grid.

-- Richard has a list of ~5 issues that he found in the reconstruction code that need to be fixed. He will investigate and report on them soon.

-- Richard expects to have 100TB of disk space on the grid in the next 6 months or so.

-- 20 million minimum bias events corresponds to roughly 5 minutes of data taking. There was some discussion of how this effort will scale to larger data sets.

  • Particle ID and tracking issues using the particle gun (Kei Moriya)

-- Kei presented an overview of the Kalman Filtering technique.

-- There was an unresolved question concerning whether the best chi2 to report is after the initial filtering stage or after the smoothing stage.

  • Analysis of b1pi (Igor Senderovich)

-- Igor is working on an omega pi pi generator using the IU 3pi generator as a template.

  • Kinematic fitting in b1pi (Will Levine)

-- Will is looking at pulls from kinematic fits. It doesn't look like a simple scaling of errors will be enough to correct the pulls. He is currently isolating tracks from different regions of the detector.

  • Simulations of cascade baryons (Nathan Sparks)

-- Nathan has found a number of poorly reconstructed tracks with fairly high momentum (1 GeV), and will send a file to David and Simon for diagnostics.

-- Nathan is attempting to reincorporate the Cerenkov detector into the simulation. Richard will help resurrect the code, which is based on a design Eugene presented a few years ago.

  • Analysis of gamma p --> eta pi0 p (Irina Semenova and Andrei Semenov)
  • Tracking update (simon)

-- Simon presented an update on the tracking code. The residuals (especially in the transverse vertex positions) seem to be a little off. It's still under investigation.

-- The calib package was updated to fix a bug in pedestals, which led to a class of tracks having unrealistically large fitting probabilities.