GlueX PID Meeting, July 14, 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
      1. Dependence of dE/dx on N (Simon), using Run 30274.
  3. PID Selections and Systematics Task Force


Attendees: Alex A., Sean, Mahmoud, Mark D., Daniel L., Naomi, Nilanga, Susan, S.T.

  • Daniel reported Lepton ID performance for a few different algorithms
    • His most recent ML algorithm gives the best results for S/sqrt(S+B)
  • Naomi looked at dE/dx in CDC using simulated bggen events
    • Sees the bump behavior near 70 degrees in the bggen events (roughly in the same place as for real data), not present for particle gun
  • S.T. showed dependence of dE/dx in FDC and CDC on number of hits used in dE/dx calculation
  • Mahmoud continues comparison of timing between MC and data for η→γγ events
    • for data the time difference distributions are asymmetric -- Daniel suggested using "Crystal barrel" function
    • MC a little wider than real data