Meeting time and location

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

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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...