JEF meeting Nov 3, 2014

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Meeting time and location

13:30 EST (JLab time) CC F326-327

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  1. Task list updates
  2. Dave's trip to China: brief report
  3. AOB


Attendees: ST, Dave Mack, Justin Stevens, Jing Feng

  • ST contacted Bill Briscoe (GWU) -- they are interested, will get back to us regarding task list
  • JS: MIT group is looking into rates and efficiencies for η→3π and η'→ηππ, including events that have additional pions.
    • DM: if we expand the beam photon energy range below the coherent peak, the cross section increases and we may be able to use photons in the BCAL to increase the yield of η→π+π-π0 events. However, we do not have complete coverage in the tagger below 8 GeV (for 12 GeV electron beam).
    • Mike Williams (MIT) will be attending the upcoming meeting at UMass (follow-up to meeting in March)
  • DM mentioned that η' decays also provide a window into dark matter physics via η'→γB, B→π+π-π0. There is also interest in "invisible" or "partially visible" decays whereby the B decays to particles that are not detectable in the GlueX apparatus.
  • DM gave a report regarding his recent trip to China. See his slides for more information.
  • DM: if we find out that we lose a significant amount of decay photons through the hole in the acceptance near the beam line, we could consider adding another calorimeter downstream of FCAL.
  • DM brought up the issue of accidentals in the tagger hodoscope/microscope. The significance of this as a function of luminosity needs to be studied.
  • DM has been in contact with the William and Mary group -- maybe some involvement (student(s)?) in the future? Funding for GlueX/HallD involvement not listed in their grant proposal right now...