Difference between revisions of "Pi0 Polarizability Meeting Sep 13, 2019"

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## Elton has not received any response from emails to Dai. Lingyun Dai, Hunan University: Changsha, Hunan, CN (dailingyun@hnu.edu.cn)
 
## Elton has not received any response from emails to Dai. Lingyun Dai, Hunan University: Changsha, Hunan, CN (dailingyun@hnu.edu.cn)
 
# [[Media:PionPolarizabilities-Theory.pdf | Theory Priorities]] (Jose)
 
# [[Media:PionPolarizabilities-Theory.pdf | Theory Priorities]] (Jose)
 +
## Corrections due to virtuality. Jose mentioned that his recollection was that estimates of higher order corrections was 30%. There are both higher order ChiPT corrections in addition to corrections due to virtuality of the exchanged photon
 +
# Aleks suggested that one could calculate Compton scattering off a pi0 at one loop and evaluate the corrections due to virtuality in that case. It was agreed that this would be a good start
 +
## Dispersive approach
 +
##* Evaluating the impact of high mass data on the  experiment may be important for the proposal.
 +
##* Elton will provide a t distribution for the reaction.
 +
##* Current group of theorists do not have great expertise in this area. One would need to learn about the approach and contact experts in this field.
 +
##* We will reach out to experts in these areas (Pasquini, Moussallam, Dai and others) to see if they would be willing to support this effort.
 +
## Sensitivity of polarization to cross section
 +
##* This depends on which meson exchanges (e.g. rho?) contribute to the reaction. One needs to identify the main exchanges.
 +
##*
 
# Other business
 
# Other business
 
# Next meeting
 
# Next meeting

Revision as of 13:53, 13 September 2019

Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

CC F228

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Action Items

  1. Theory priority list and how to address them (Jose) Jose presented a list which was discussed by the group.

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Theory Priorities (Jose)
  4. Other business
  5. Next meeting

Minutes

Attending: Alex (CMU); Mark, Jose, Beni, Elton (JLab); Aleks, Svetlana (MUN) ; Ilya, Rory (UMass).

  1. Announcements
  2. Action Items
    1. Elton has not received any response from emails to Dai. Lingyun Dai, Hunan University: Changsha, Hunan, CN (dailingyun@hnu.edu.cn)
  3. Theory Priorities (Jose)
    1. Corrections due to virtuality. Jose mentioned that his recollection was that estimates of higher order corrections was 30%. There are both higher order ChiPT corrections in addition to corrections due to virtuality of the exchanged photon
  4. Aleks suggested that one could calculate Compton scattering off a pi0 at one loop and evaluate the corrections due to virtuality in that case. It was agreed that this would be a good start
    1. Dispersive approach
      • Evaluating the impact of high mass data on the experiment may be important for the proposal.
      • Elton will provide a t distribution for the reaction.
      • Current group of theorists do not have great expertise in this area. One would need to learn about the approach and contact experts in this field.
      • We will reach out to experts in these areas (Pasquini, Moussallam, Dai and others) to see if they would be willing to support this effort.
    2. Sensitivity of polarization to cross section
      • This depends on which meson exchanges (e.g. rho?) contribute to the reaction. One needs to identify the main exchanges.
  5. Other business
  6. Next meeting
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