Difference between revisions of "Pi0 Polarizability Meeting Jun 5, 2020"

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(Minutes)
Line 68: Line 68:
  
 
# Announcements
 
# Announcements
 +
#* JLab proceeding to Medcon5 on Monday
 
# Action Items
 
# Action Items
 
# Feedback from collaboration review
 
# Feedback from collaboration review
 +
#* Reinhard sent out an announcement to the collaboration to comment on the NPP draft. Comments expected back at the end of June and a vote will follow
 
# Theory update
 
# Theory update
 +
#* Ilya is in communication with Serguei who promises formulas updates soon.
 
# Collaboration draft
 
# Collaboration draft
 
## Backgrounds
 
## Backgrounds
##* npp_analysis (Mark)
 
 
##* BGGEN (PYTHIA)
 
##* BGGEN (PYTHIA)
 +
##** No results yet
 
##* More realistic eta production?
 
##* More realistic eta production?
##**[https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4523 Broken Etas2] (Elton)
+
##** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4523 Broken Etas2] (Elton)
 +
##** A new event generator gen_EtaPb currently simulates the NC production of etas. They are decayed using geant4.
 +
##** Distributions from this generator were presented. They show that the  theta_pipi scattering angle peaks at lower angles, beginning at the angle for NC pi0pi0 production.
 +
##** The normalization was investigated comparing results to Rory's discussion in the appendix draft.
 +
##** Elton will evaluate the normalization for both Primakoff and NC eta production for the next meeting
 
## Experiment optimization
 
## Experiment optimization
 
## Significance of experiment
 
## Significance of experiment
Line 82: Line 89:
 
## Analysis of PRIMEX data  
 
## Analysis of PRIMEX data  
 
# Other business
 
# Other business
 +
## Evaluation of eta backgrounds (Beni)
 +
##* Beni generated 100k eta's at 6 GeV and at zero angle.
 +
##* The etas were decayed to 3pi0 using hdgeant and reconstructed using standard analysis
 +
##* The distributions provide nice intuition as to how this background might contaminate our signal.
 +
##* A good rule-of-thumb is that 1/200 etas will reconstruct to a 2pi0 final state with energy or 6 GeV, i.e. look like our signal.
 
# Next meeting
 
# Next meeting
 +
#* Friday June 10 at 10 am.

Revision as of 13:37, 5 June 2020

Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

REMOTE

Connecting

You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):

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    • Enter meeting ID above


Action Items

  1. ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
  2. BGGEN simulations of incoherent backgrounds (Mark)
  3. Simulate (broken) eta's with more realistic production model (Elton)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Feedback from collaboration review
  4. Theory update
  5. Collaboration draft
    1. Backgrounds
      • npp_analysis (Mark)
      • BGGEN (PYTHIA)
      • More realistic eta production?
    2. Experiment optimization
    3. Significance of experiment
    4. Analysis of PRIMEX data
  6. Other business
  7. Next meeting

Minutes

Attending: Mark, Rory, Beni, Alex, Ilya

  1. Announcements
    • JLab proceeding to Medcon5 on Monday
  2. Action Items
  3. Feedback from collaboration review
    • Reinhard sent out an announcement to the collaboration to comment on the NPP draft. Comments expected back at the end of June and a vote will follow
  4. Theory update
    • Ilya is in communication with Serguei who promises formulas updates soon.
  5. Collaboration draft
    1. Backgrounds
      • BGGEN (PYTHIA)
        • No results yet
      • More realistic eta production?
        • Broken Etas2 (Elton)
        • A new event generator gen_EtaPb currently simulates the NC production of etas. They are decayed using geant4.
        • Distributions from this generator were presented. They show that the theta_pipi scattering angle peaks at lower angles, beginning at the angle for NC pi0pi0 production.
        • The normalization was investigated comparing results to Rory's discussion in the appendix draft.
        • Elton will evaluate the normalization for both Primakoff and NC eta production for the next meeting
    2. Experiment optimization
    3. Significance of experiment
    4. Analysis of PRIMEX data
  6. Other business
    1. Evaluation of eta backgrounds (Beni)
      • Beni generated 100k eta's at 6 GeV and at zero angle.
      • The etas were decayed to 3pi0 using hdgeant and reconstructed using standard analysis
      • The distributions provide nice intuition as to how this background might contaminate our signal.
      • A good rule-of-thumb is that 1/200 etas will reconstruct to a 2pi0 final state with energy or 6 GeV, i.e. look like our signal.
  7. Next meeting
    • Friday June 10 at 10 am.