Pi0 Polarizability Meeting Dec 6, 2019

Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

CC F228

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Action Items

1. ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
2. Formulate questions for Serguei (Elton and Ilya)
3. Look at gp->pi0pi0 from empty target runs (Alex) See meeting notes
4. Contact theorists:
   • Lingyun Dai, Hunan University: Changsha, Hunan, CN (dailingyun@hnu.edu.cn)

Tentative Agenda

1. Announcements
2. Action Items
3. Theory update
   1. Notes Jose 12/6/2019
4. Experiment update
   1. Empty target run 51556 (Fall 2018): [1], [2], [3]
5. Other business
6. Next meeting

Minutes

Attending: Elton, Beni, Alex, Jose, Mark, Rory, Phil Martel , Lingyun Dai

1. Announcements
   • Svetlana and Aleks are in Chile
   • Accelerator is restarting operations
2. Action Items
3. Theory update
   1. Notes Jose 12/6/2019
      • Update on amplitudes: A and B remain, but amplitude C is zero by current conservation.
      • Formulation goes back to Morgan and Pennington (1986) using Donahue and Holstein (1992-93) to model A and B. These should be sufficient for simulating the experiment. Specifics involve how to deal with final state interactions and they choose to keep s-channel s-waves and vector mesons in the t and u channels.
      • Dispersion relation is for P_I(s), which is related to form factors f_0 and f_2.
      • Parameterization of s-waves is needed. Elton has a reference that he will share with Jose.
      • Lingyun. He has parameterizations of the partial waves and showed the I=0 S=0 phase shift. Offline discussions with Jose to develop a set to use for this experiment.
4. Experiment update
   1. Empty target run 51556 (Fall 2018): [4], [5], [6]
5. Other business
6. Next meeting