[Clas_hadron] Hall_B/JPAC/Theory Center Meeting, Thursday, March 10, F113, 3.30 pm

[Viktor Mokeev]

Dear Colleagues,

 We will have the next Hall-B/JPAC/Theory Center Meeting aimed to discuss the status and prospects for evaluation of the electromagnetic transition meson form factors and gvNN* electrocouplings from the first principles of QCD employing the recent advances in the Lattice QCD studies. Particular focus will be the evaluation of the strategy allowing us to confront the LQCD expectations on the meson/N* parameters to the results of the experiments on the studies of meson/nucleon resonances in exclusive photo-/electropropduction processes from available and foreseen in 12 GeV era the Jlab data. These important subjects will be presented in the talk by Dr. R.Briceno (Jefferson Lab): 

``Meson electro/photo-production from QCD"

Abstract:

I present the calculation of the π+γ⋆→ π+π0 transition amplitude from quantum chromodynamics. The amplitude is determined for a range of values of the photon virtuality [up to Q^2=1 GeV^2] and the final state energy. One observes a clear dynamical enhancement due to the presence of the ρ-resonance. By fitting the transition amplitude and analytically continuing it onto the ρ-pole, the ρ → πγ⋆ form factor is obtained. This exploratory calculation, performed using lattice quantum chromodynamics, constitutes the very first determination of an electromagetic production/decay of a hadronic resonance directly from the fundamental theory of quarks and gluons. I highlight some of the necessary steps that made this calculation possible, and I discuss the status and outlook of the field for the study of Nγ⋆ → N⋆ → Nπ/Nππ transitions.

The Meeting is scheduled for March 10, 2016, room F113 CEBAF Center, 3.30 pm. The instruction for the remote connection and the talk slides will be available later on.

Looking forward to see you at Meeting,

  On behalf of Hall-B and JPAC:

                                   V.Mokeev