Pi0 Polarizability Meeting Jun 12, 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 -->):

1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:
   • http://jlab.bluejeans.com (You should only need to do this once)

   
   

2. Meeting ID: 949 429 419
   • (you may need to type this in, depending how you connect)

   
   

3. If connecting via Web Browser: click this link (no passcode is needed):
   • https://bluejeans.com/949429419

   
   

4. If connecting via iOS or Android App:
   • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

   
   

5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
   • Dial: (408) 740-7256 (US or Canada only)
   • or, List of International Numbers

   
   

6. If connecting via Polycom unit:
   • Dial 199.48.152.152 or bjn.vc
   • 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. Wrap Up (Elton)
   2. Backgrounds
      • BGGEN (PYTHIA)
      • More realistic eta production?
   3. Experiment optimization
   4. Significance of experiment
      • Proposal Draft
   5. Analysis of PRIMEX data
6. Other business
7. Next meeting

Minutes

Attending: Mark, Ilya, Elton, Jose, Beni, Alex

1. Announcements
2. Action Items
3. Feedback from collaboration review
4. Theory update
5. Collaboration draft
   1. Wrap Up (Elton)
      • Primakoff-eta and NC-eta files were generated. The normalization was obtained using the scaling rules developed by Rory.
      • The estimate is that broken etas represent 37% of the Primakoff-pi0pi0 signal.
      • The Overleaf document has been updated with the new distributions. The overall conclusion does not change, but the study is more complete.
      • The table of uncertainties (Table 3) has been modified based on our discussion a couple of weeks ago and the flux uncertainty has been removed.
      • A new estimate of the systematic uncertainty in signal extraction was made, but leaves the 3% in the table unchanged.
   2. Backgrounds
      • BGGEN (PYTHIA)
        • Mark: Has been able to generate bggen events interactively. In a session with Thomas this morning he has charted a course to generate many more events on the farm. He hopes to have some distributions to show by mid week
        • We may not have time to digest the information from this study before the proposal is submitted. It will be useful to see if there is any peaking structures in this background. It remains a useful study for backup at the PAC presentation.
   3. Experiment optimization
   4. Significance of experiment
      • Proposal Draft
   5. Analysis of PRIMEX data
6. Other business
   • Elton will update the Overleaf document and make available by the end of the day.
   • Mark promised to read the whole document and give feedback.
7. Next meeting
   • Possibly next Friday if we need to finalize any details before final submission of the proposal.