Pi0 Polarizability Meeting Oct 9, 2020

Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

REMOTE

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Action Items

1. ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
2. BGGEN simulations of incoherent backgrounds (Mark)
3. Calculations by Sergey Gevorkyan

Tentative Agenda

1. Announcements
2. Action Items
3. PAC48
   • GlueX Endorsement
   • PAC48 Final Report
4. Theory Update
5. Beam Test
6. Other business
7. Next meeting

Minutes

Attending: Elton, Alex A, Rory, Ilya, Jose, Beni

1. Announcements
2. Action Items
3. PAC48
   • GlueX Endorsement
   • PAC48 Final Report
   • NPP and CPP were favorably reviewed by the PAC and we are encouraged to run the experiment in 2022.
4. Theory Update
   • Calculations by Sergey Gevorkyan
   • Ilya gave an update on Sergey's efforts
   • There is a draft writeup, representing the work to date. These results were available in June, but not in time to include into the PAC submission
   • The calculations are based on the PRIMEX formalism with modifications for two pion production.
   • We are asked to read the draft and provide feedback to Sergey. He is also looking for help with numerical calculations.
   • We promise to provide feedback in the next couple of weeks.
5. Beam Test
   • Draft Beam Test Report
   • See Section 5 on FCAL trigger. Estimated FCAL trigger at 20 nA and NPP radiator is 13 kHz (no DIRC or Pb shield). The FCAL threshold is about > 0.7 GeV (nominally 0.5 GeV).
   • These rates are quite acceptable and may allow us to run at somewhat higher current.
6. Other business
7. Next meeting
   • Due to the collaboration meeting in two weeks, we will not meet again till Nov 6.