Pi0 Polarizability Meeting Apr 24, 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. Follow-up contact with Marc to request paragraph (Rory)

Tentative Agenda

1. Announcements
2. Action Items
3. Feedback from collaboration review
   1. Feedback from Barry / Tue Apr 14
      • Rory: The estimate of the incoherent is not easy, but should be uniform in Phi, so polarization is a valuable tool.
   2. Feedback from Joerg
      • We need to clarify that CPP will run with a Pb target and we need an estimate of the calorimeter trigger rate to insure that NPP can run concurrently with CPP. Ilya was volunteered for this task.
4. Theory update
   1. Discussion with Serguei Gevorkyan / Mon Apr 13
5. Experiment update
   1. GlueX-doc-4433 Eta background (Elton)
6. Updates to collaboration draft
   1. Backgrounds to be simulated
      • Background hits
      • BGGEN (PYTHIA)
      • eta production (Elton)
      • Incoherent production (Elton)
      • Npipi
   2. Table of cross sections (Rory and Ilya)
      • Include references to relevant data
      • Add values used in the proposal
   3. Experiment optimization
      • Target position (Beni).. not yet
      • Beam energy:
      • Generate angular distributions for some other targets to compare to Pb
   4. Significance of experiment
      • The expected uncertainties of the extracted gg->pi0pi0 cross section (Fig. 24 of proposal) need to be verified and studied more carefully
   5. Analysis of PRIMEX data
7. Other business
8. Next meeting

Minutes

Attending: