Difference between revisions of "JEF meeting, June 11, 2021"

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(Agenda)
Line 28: Line 28:
 
* Simulations
 
* Simulations
 
** [https://halldweb.jlab.org/wiki/images/4/44/Glue-jefxd-igal-jaegle-11062021.pdf S to pipi]
 
** [https://halldweb.jlab.org/wiki/images/4/44/Glue-jefxd-igal-jaegle-11062021.pdf S to pipi]
 +
 +
=Minutes=
 +
Attendees: Igal,Jon,Bill,Susan,Sasha,Jared,Azizah,Varun,Liping,Tim W.,Igor,Zisis
 +
* 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

Revision as of 15:33, 11 June 2021

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


Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

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

  • 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