Difference between revisions of "Pi0 Polarizability Meeting Mar 13, 2020"
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## Marc Vanderhaeghen | ## Marc Vanderhaeghen | ||
##* Svetlana met with Marc Vanderhaeghen, Igor Danilkin and also Vladimir Pascalutsa when she was in Germany. | ##* Svetlana met with Marc Vanderhaeghen, Igor Danilkin and also Vladimir Pascalutsa when she was in Germany. | ||
− | ##* They are interested in our project. Here is a note that Svetlana passed on to us from Marc: | + | ##* They are interested in our project. |
+ | ##* Jose: We need to refine the analysis in order to connect the ChiPT with the Dispersive Analysis. There should be a kinematic region of overlap and calculations should match in this region. | ||
+ | ##* Svetlana: This effort is significant and will take of order a year to complete. We should outline the calculations in the proposal and work on them over the next year. | ||
+ | ##* Jose: Proposes that Marc and collaborators add some text to the proposal that describes the impact that this experiment might have on the light-by-light scattering amplitudes. | ||
+ | ##* Here is a note that Svetlana passed on to us from Marc: | ||
<pre> | <pre> | ||
From: Vanderhaeghen, Univ.Prof.Dr. Marc <vandma00@uni-mainz.de> | From: Vanderhaeghen, Univ.Prof.Dr. Marc <vandma00@uni-mainz.de> | ||
Line 89: | Line 93: | ||
</pre> | </pre> | ||
# Action Items | # Action Items | ||
+ | #* Rory will contact Marc and follow up on this discussion. | ||
# Theory update | # Theory update | ||
# Experiment update | # Experiment update | ||
+ | #* Alex: First official monitoring launch of the PRIMEX-eta data has been completed and the ROOT trees are being created. He will send links to the completed files. | ||
# Comments on draft proposal | # Comments on draft proposal | ||
## Backgrounds to be simulated | ## Backgrounds to be simulated | ||
Line 96: | Line 102: | ||
##* BGGEN (PYTHIA) | ##* BGGEN (PYTHIA) | ||
##* eta production | ##* eta production | ||
+ | ## Experiment optimization | ||
+ | ##* Target position (Beni) | ||
+ | ##* Generate angular distributions for some other targets to compare to Pb | ||
+ | ## Significance of experiment | ||
+ | ##* The expected uncertainties of the extracted gg->pi0pi0 cross section (Fig. 24 of proposal) need to be verified and studied more carefully | ||
# Other business | # Other business | ||
# Next meeting | # Next meeting |
Revision as of 11:45, 13 March 2020
Contents
Meeting Information
Meeting Time And Location
10:00 am ET (JLab time)
CC F228
Connecting
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Action Items
- ChiPT calculation to one loop with Coulomb photon (Svetlana and Aleks)
Tentative Agenda
- Announcements
- Action Items
- Theory update
- Experiment update
- Comments on draft proposal
- Backgrounds to be simulated
- Background hits
- BGGEN (PYTHIA)
- eta production
- Backgrounds to be simulated
- Other business
- Next meeting
Minutes
Attending: Elton, David, Beni, Alex, Mark, Svetlana, Rory, Jose, Ilya.
- Announcements
- Marc Vanderhaeghen
- Svetlana met with Marc Vanderhaeghen, Igor Danilkin and also Vladimir Pascalutsa when she was in Germany.
- They are interested in our project.
- Jose: We need to refine the analysis in order to connect the ChiPT with the Dispersive Analysis. There should be a kinematic region of overlap and calculations should match in this region.
- Svetlana: This effort is significant and will take of order a year to complete. We should outline the calculations in the proposal and work on them over the next year.
- Jose: Proposes that Marc and collaborators add some text to the proposal that describes the impact that this experiment might have on the light-by-light scattering amplitudes.
- Here is a note that Svetlana passed on to us from Marc:
- Marc Vanderhaeghen
From: Vanderhaeghen, Univ.Prof.Dr. Marc <vandma00@uni-mainz.de> Sent: March 9, 2020 11:36 AM To: Barkanova, Svetlana <sbarkanova@grenfell.mun.ca> Cc: Aleksejevs, Aleksandrs <aaleksejevs@grenfell.mun.ca>; Danilkin, Dr. Igor <danilkin@uni-mainz.de> Subject: Re: draft of collaboration talk Hi Svetlana, hi Alex, I am responding to your enquiry about the pi0 polarizability and am also forwarding this e-mail to my collaborator Igor Danilkin. As I briefly told you, the pi+ polarizability which enters also the g-2 extraction is well in agreement between dispersive estimates and ChPT (see fig. 28 left panel of our recent review paper, attached showing also the Compass data point). However for pi0, the same calculation, is an order of magnitude different (and opposite sign) between Chpt and dispersion relation (both the Mainz and Bern dispersive analysis confirm this). So it would be a crucial input to have an independent result for the pi0 polarizability. We would indeed be very interested to going this effort, and can provide the calculations for this channel. Cheers, Marc
- Action Items
- Rory will contact Marc and follow up on this discussion.
- Theory update
- Experiment update
- Alex: First official monitoring launch of the PRIMEX-eta data has been completed and the ROOT trees are being created. He will send links to the completed files.
- Comments on draft proposal
- Backgrounds to be simulated
- Background hits
- BGGEN (PYTHIA)
- eta production
- Experiment optimization
- Target position (Beni)
- Generate angular distributions for some other targets to compare to Pb
- Significance of experiment
- The expected uncertainties of the extracted gg->pi0pi0 cross section (Fig. 24 of proposal) need to be verified and studied more carefully
- Backgrounds to be simulated
- Other business
- Next meeting