Pi0 Polarizability Meeting Sep 27, 2019

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Meeting Information

Meeting Time And Location

10:00 am ET (JLab time)

CC F228

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Action Items

  1. Experimental priority list and how to address them
  2. Contact theorists:
    • Lingyun Dai, Hunan University: Changsha, Hunan, CN (dailingyun@hnu.edu.cn)
    • Serguei Gevorkyan
    • Barbara Pasquini
  3. Provide a t distribution for pi0 Primakoff (Elton)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Look at (PRIMEX) Be target data (Ilya)
    1. First look at Be data pdf
    2. FCAL only acceptance for 0.5GeV single gamma energy cut and different production angles and 2pi0 inv. mass values acceptance plots. Beam energy: Blue - 4GeV, Black - 6GeV, Red - 8GeV, Green - 10GeV
    3. 2pi0 production on Be yield comparison: 0.5GeV single gamma energy cut, extra events from reducting FCAL energy cut to 0.3GeV plot
  4. Experimental Issues for Proposal
    1. Event generator: Do we need to upgrade our model?
    2. Systematic assessment of backgrounds: f0(500), gA->Aeta, eta->pi0pi0(pi0), incoherent gp->pi0pi0 p
    3. Additional analysis of hydrogen data (Beni)?
    4. Experimental Configuration for CPP
    5. Optimization of running time: time, target(s), beam energy, compatibility with CPP
  5. Other business
  6. Next meeting

Minutes

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

  1. Announcements
  2. Action Items
  3. Look at (PRIMEX) Be target data (Ilya)
    1. First look at Be data pdf
      • 2 days of Be data, trigger threshold ~ 4 GeV
    2. FCAL only acceptance for 0.5GeV single gamma energy cut and different production angles and 2pi0 inv. mass values acceptance plots. Beam energy: Blue - 4GeV, Black - 6GeV, Red - 8GeV, Green - 10GeV
      • All photons are required to hit the Fcal.
      • Acceptance seems to be a strong function of energy at least for 4 photons in the Fcal.
    3. 2pi0 production on Be yield comparison: 0.5GeV single gamma energy cut, extra events from reducting FCAL energy cut to 0.3GeV plot
  4. Experimental Issues for Proposal
    1. Event generator: Do we need to upgrade our model?
      • Jose will take a look at this
    2. Systematic assessment of backgrounds: f0(500), gA->Aeta, eta->pi0pi0(pi0), incoherent gp->pi0pi0 p
    3. Additional analysis of hydrogen data (Beni)?
      • Beni will continue his studies with 2018 data.
    4. Experimental Configuration for CPP
    5. Optimization of running time: time, target(s), beam energy, compatibility with CPP
      • Beni: We need to check that at low-current bleed-through is not an issue.
  5. Other business
  6. Next meeting
    • Next meeting is at 10 am on Oct 11. We will get an update on the theory issues.