Difference between revisions of "Pi0 Polarizability Meeting Mar 6, 2020"

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#* Update to theory section of proposal. Expect to have a draft of an appendix with more details by next Wed.
 
#* Update to theory section of proposal. Expect to have a draft of an appendix with more details by next Wed.
 
# Experiment update  
 
# Experiment update  
−
#* Ilya: Using single pi0 Coulomb FF to estimate cross sections for 2pi0. Replace longitudinal momentum transfer qL ~ mpi -> 2mpi, and scattering of pi0 in final state -> 2x scattering for 2 pi0.
+
## Signal cross sections  (Ilya)
−
#* Calculate FF show oscillations that require increased precision and Ilya has increased granularity and computing time. Glauber calculation includes final-state absorption and computes real and imaginary part of FF.
+
##* Ilya has used the FF taken from single pi0 calculations and used  to estimate cross sections for 2pi0. Replace longitudinal momentum transfer qL ~ mpi -> 2mpi, and scattering of pi0 in final state -> 2x scattering for 2 pi0.
 +
##* Calculation of FF shows oscillations that require increased precision and Ilya has increased granularity and computing time. Glauber calculation includes final-state absorption and computes real and imaginary part of FF.
 +
##* Comparing to Elton
 
#* Evaluating photon flux for the Primex-eta run so that preliminary cross sections can be produced.
 
#* Evaluating photon flux for the Primex-eta run so that preliminary cross sections can be produced.
 
#* Elton: Showed angular distribution for Primex and nuclear coherent components. No clear distinction between components is seen in the combined angular distribution.  
 
#* Elton: Showed angular distribution for Primex and nuclear coherent components. No clear distinction between components is seen in the combined angular distribution.  

Revision as of 14:57, 12 March 2020

Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

CC F228

Connecting

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Action Items

  1. ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Theory update
  4. Experiment update
  5. Work list for the draft proposal to collaboration
    • Clarification to questions from the PAC where possible
    • Update to theory section (Jose and Mark)
    • Sensitivity of cross section to polarizabilities
      • Jose: The sensitivity is determined by extrapolating into the kinematic region for polarizabilities and will take effort. For now, we will use the estimates from Dai/Pennington.
    • Initial optimization of experiment (e.g. target position)
      • This item will not be attempted for the proposal draft.
    • Analysis of PRIMEX data (Ilya)
    • Assessment of nuclear coherent background (Elton)
      • What is the t-dependence of the sigma (500)?
  6. Theory Appendix from Jose
  7. Other business
  8. Next meeting

Minutes

Note: I am writing these notes from memory without good notes and memory might not be accurate. Attending: Jose, Mark, Elton, Alex,

Tentative Agenda

  1. Announcements
    • Goal is to have a all input to the draft proposal by next Wednesday so it can be reviewed and submitted by next Friday.
  2. Action Items
  3. Theory update
    • Update to theory section of proposal. Expect to have a draft of an appendix with more details by next Wed.
  4. Experiment update
    1. Signal cross sections (Ilya)
      • Ilya has used the FF taken from single pi0 calculations and used to estimate cross sections for 2pi0. Replace longitudinal momentum transfer qL ~ mpi -> 2mpi, and scattering of pi0 in final state -> 2x scattering for 2 pi0.
      • Calculation of FF shows oscillations that require increased precision and Ilya has increased granularity and computing time. Glauber calculation includes final-state absorption and computes real and imaginary part of FF.
      • Comparing to Elton
    • Evaluating photon flux for the Primex-eta run so that preliminary cross sections can be produced.
    • Elton: Showed angular distribution for Primex and nuclear coherent components. No clear distinction between components is seen in the combined angular distribution.
    • Rory: We should take a look at light nuclei and see how the angular distribution changes.
  5. Work list for the draft proposal to collaboration
    • Clarification to questions from the PAC where possible
    • Update to theory section (Jose and Mark)
    • Sensitivity of cross section to polarizabilities
      • Jose: The sensitivity is determined by extrapolating into the kinematic region for polarizabilities and will take effort. For now, we will use the estimates from Dai/Pennington.
    • Initial optimization of experiment (e.g. target position)
      • This item will not be attempted for the proposal draft.
    • Analysis of PRIMEX data (Ilya)
    • Assessment of nuclear coherent background (Elton)
      • What is the t-dependence of the sigma (500)?
  6. Theory Appendix from Jose
  7. Other business
  8. Next meeting
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