Pi0 Polarizability Meeting Feb 28, 2020
From GlueXWiki
Contents
Meeting Information
Meeting Time And Location
10:00 am ET (JLab time)
CC F228
Connecting
You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):
- 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)
- Meeting ID: 949 429 419
- (you may need to type this in, depending how you connect)
- If connecting via Web Browser: click this link (no passcode is needed):
- 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
- 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
- If connecting via Polycom unit:
- Dial 199.48.152.152 or bjn.vc
- Enter meeting ID above
Action Items
- ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
Tentative Agenda
- Announcements
- Action Items
- Theory update
- Experiment update
- Update (Elton)
- 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)?
- Other business
- Next meeting
Minutes
Attending: Elton, Beni, Ilya, Alexander, Jose, Mark, Rory
- Announcements
- Action Items
- Theory update
- Updates to proposal
- Jose modified the text and Mark included it into the draft early this week. It includes some clarifications and new references
- Details of Jose's calculation will be added into an Appendix.
- Experiment update
- (Ilya)
- Computed the Coulomb FF by modifying the parallel momentum for the increased mass and the cross section scaled for two pions (x2)
- Rory: How does this differ from the standard electron scattering FF? It is a Glauber calculation that includes absorption corrections for the pion.
- The calculation shows enhanced secondary maximum relative to single pi0. The higher momentum transfer requires increased precision in the calculation, which has required more computer time.
- Ilya is now working on obtaining the photon flux for the Primex-eta experiment, so that the data can be properly normalized.
- Update (Elton)
- 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)?
- Other business
- Next meeting