JEF meeting, June 11, 2021

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Revision as of 15:33, 11 June 2021 by Staylor (Talk | contribs) (Minutes)

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Meeting time and location= 9:00 am EST (JLab time) Bluejeans only


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Agenda

  • SICCAS crystals
  • Module fabrication
  • COMCAL tests, TAC running, etc.
  • Data analysis
    • GlueX-I eta yield estimates (Jon) [1]
  • Simulations

Minutes

Attendees: Igal,Jon,Bill,Susan,Sasha,Jared,Azizah,Varun,Liping,Tim W.,Igor,Zisis,S.T.

  • Plan to set up follow-up meeting with SICCAS next week(?) after SICCAS meets with one of their vendors
    • No update on crystal delivery
  • Sasha has been spending most of his time working on getting COMCAL ready to go for upcoming PrimEx run
    • Almost finished checking PMT dividers: found a few outliers with larger divider current or smaller amplitudes, put aside to be replaced
    • Visually inspected all COMCAL crystals, checking for quality of coupling to PMT (with optical grease)
      • Saw some bubbles, some evidence that grease had dried out
      • For several modules (~20%), reapplied grease and reinstalled -- looks like this improved coupling
      • Question: how long does the optical grease last?
  • Progress continues in refurbishment of LMS for COMCAL
    • Fibers to be reinstalled next week
  • Fernando making progress on PMT divider/amplifier redesign for FCAL-2, plan to build ~2 prototypes
  • Chris A. working on brazing of brass straps
    • Adjusting temperature control -- some evidence of overheating?
    • Flux has to be cleaned off carefully to avoid corrosion
    • Reproduced force analysis
  • Liping will send 2 students to JLab for the summer now that lab is in MedCon-4
  • Liping will be hiring postdoc to work on PrimEx/JEF-related efforts
  • Jon presented estimates of number of ηs produced in 2γ, π+π-&pi0, and 3π0 channels for Spring'17+Spring'18 + Fall'18 data sets
    • Agreement in t-dependence of 3 channels is very good
    • Models tend to overestimate differential cross section
    • Guess for systematic error is ~10% level (differences in 3 channels, luminosity,...)
    • Plan for η cross section publication
  • Igal presented a first study for sensitivity to S→π+π- in the channels η→π0S, η'→π0S; η'→ηS
    • Kinematic fit but no mass constraints
    • In data see clear signals for η→&pi0;π+π- and η'→ηπ+π-, but no signal seen in η'→π0π+π-
    • Estimated pdf and efficiency for S in the three search channels