GlueX PID Meeting, July 28, 2020

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Meeting time and day: 10:30 am, Tuesdays

Meeting Connections

  1. To join via a Web Browser, go to the page [1]
  2. To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 927733173.
  3. To join via phone, use one of the following numbers and the Conference ID: 927733173.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560


  1. Announcements
  2. Updates:
    1. Multivariate method
    2. CDC dE/dx
    3. PIDFOM

Dependence of dE/dx resolution on number of hits (20% truncation) and momentum for pions

Fdc ndep2.PNG Fdc ndep.PNG Cdc ndep.PNG

  1. PID Selections and Systematics Task Force


Attendees: Mark I., Justin, Daniel, Naomi, Sean, Mahmoud, Beni, Mark D., Susan, Alex A., S.T.

  • Daniel continues to work on testing new ML algorithm on di-lepton data
  • Naomi reported on her continuing CDC dE/dx studies.
    • Finds good qualitative agreement between bggen and data
      • Strange bump in dEdx for tracks near 70 degrees shows up in both
      • Bumps and wiggles depend on number of tracks
    • Improved dE/dx (for amplitude) correction map (to get rid of θ dependence in data)
      • Corrected dE/dx shows better separation between proton and kaon bands at low momentum
      • Corrected dE/dx looks more like MC dE/dx
      • Correction map does not work as well for dE/dx using CDC integral
  • S.T. showed dependence of dE/dx on number of hits used in calculation and momentum
    • Naomi's correction was not applied yet
    • Same general shape for all momenta except for low N in CDC
  • Mahmoud continues comparing timing for MC/data using η→γγ
    • MC resolution does not depend on p, but real data does
    • MC resolution is worse than real data resolution
    • Means for both data and MC depend on p