Pi0 Polarizability Meeting Mar 13, 2020

From GlueXWiki
Revision as of 11:34, 13 March 2020 by Elton (Talk | contribs) (Minutes)

Jump to: navigation, search

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 -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  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):

  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 "##"

  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)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Theory update
  4. Experiment update
  5. Comments on draft proposal
    1. Backgrounds to be simulated
      • Background hits
      • BGGEN (PYTHIA)
      • eta production
  6. Other business
  7. Next meeting

Minutes

Attending: Elton, David, Beni, Alex, Mark, Svetlana, Rory, Jose, Ilya.

  1. Announcements
    1. Marc Vanderhaeghen
      • 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:
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
  1. Action Items
  2. Theory update
  3. Experiment update
  4. Comments on draft proposal
    1. Backgrounds to be simulated
      • Background hits
      • BGGEN (PYTHIA)
      • eta production
  5. Other business
  6. Next meeting