Difference between revisions of "Pi0 Polarizability Meeting Dec 20, 2019"

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== Action Items ==
 
== Action Items ==
 
# ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
 
# ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
−
# Formulate questions for Serguei (Elton and Ilya)
+
# <strike> Formulate questions for Serguei (Elton and Ilya) </strike> Ask Sergey to calculate nuclear coherent sigma production on lead.
−
# Specify s-wave parameterization (Elton and Lingyun)
+
# <strike> Specify s-wave parameterization (Elton and Lingyun) </strike> Elton passed references to a limited parameterization; Lingyun has been copied on e-mails.
  
 
== Tentative Agenda ==
 
== Tentative Agenda ==
Line 57: Line 57:
  
 
=Minutes=
 
=Minutes=
−
''Attending:
+
''Attending: Elton, Jose, Rory, Mark
 +
 
 +
# Announcements
 +
#* Accelerator is shutting down this evening. No beam since yesterday swing. The accelerator will be manned over the holiday and they expect a quick start in Jan.
 +
# Action Items
 +
#* Questions to Sergey
 +
#* We decided that the main request to Sergey is to ask if he can calculate the coherent sigma production on lead. This includes final state interactions (FSI) of the two pions.
 +
#* Rory: This calculation should be doable for Sergey given he machinery he has developed for pi0 Primakoff.
 +
#* Elton: In particular the t dependence of this reaction would be useful.
 +
#* Jose: The calculation should be similar for the charged pion production also. Both involve strong production of two pions although FSI may be different.
 +
# Theory update
 +
#* [[Media:NOTES-JOSE Dec19 2019.pdf | Jose's Notes Dec 19 2019]]
 +
#* Recall: There are two Compton Tensors A and B (C does not contribute)
 +
#* Use the model by Holstein and Donahue to calculate f0 and f2 form factors that determine A and B
 +
#* f0 and f2 are determined by the s-wave phase shifts. Uses parameterization of Gasser, Leutweiler and Colangelo.
 +
#* The phase shifts are well known to about
 +
# Experiment update
 +
# Other business
 +
# Next meeting

Revision as of 15:19, 20 December 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) Ask Sergey to calculate nuclear coherent sigma production on lead.
  3. Specify s-wave parameterization (Elton and Lingyun) Elton passed references to a limited parameterization; Lingyun has been copied on e-mails.

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Theory update
  4. Experiment update
  5. Other business
  6. Next meeting

Minutes

Attending: Elton, Jose, Rory, Mark

  1. Announcements
    • Accelerator is shutting down this evening. No beam since yesterday swing. The accelerator will be manned over the holiday and they expect a quick start in Jan.
  2. Action Items
    • Questions to Sergey
    • We decided that the main request to Sergey is to ask if he can calculate the coherent sigma production on lead. This includes final state interactions (FSI) of the two pions.
    • Rory: This calculation should be doable for Sergey given he machinery he has developed for pi0 Primakoff.
    • Elton: In particular the t dependence of this reaction would be useful.
    • Jose: The calculation should be similar for the charged pion production also. Both involve strong production of two pions although FSI may be different.
  3. Theory update
    • Jose's Notes Dec 19 2019
    • Recall: There are two Compton Tensors A and B (C does not contribute)
    • Use the model by Holstein and Donahue to calculate f0 and f2 form factors that determine A and B
    • f0 and f2 are determined by the s-wave phase shifts. Uses parameterization of Gasser, Leutweiler and Colangelo.
    • The phase shifts are well known to about
  4. Experiment update
  5. Other business
  6. Next meeting
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