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Nucleon Resonance Structure in Exclusive Electroproduction at High Photon Virtualities
August 13-15, 2012
University of South Carolina
Columbia, South Carolina


The next workshop in our series "Nucleon Resonance Structure in Exclusive Electroproduction at High Photon Virtualities" will be held at the University of South Carolina on August 13-15, 2012. It follows in the sequence of our two previous workshops in October 2008*/index.html and May 2011 both held at Thomas Jefferson National Accelerator Facility in Newport News Virginia. The upcoming three-day workshop will provide us new opportunities to present and discuss in depth future developments and preliminary results on the continuous exploration of hadronic physics towards smaller distances.

In the tradition of this workshop, we will hence focus on the extension of the γvNN* electrocoupling studies to high photon virtualities from 5.0 to 12.0 GeV2. This is the kinematic area, where the N* structure is still almost unexplored, and which will be comprehensively covered for the first time by the approved experiment PR12-09-003 on N* studies in exclusive meson electroproduction off protons with the CLAS12 detector. The experiment will be carried out in the first five years after the completion of the Jefferson Lab 12-GeV Upgrade Project. By that time ready-to-use methods for the extraction of the γvNN* electrocouplings at high photon virtualities are needed as well as general QCD-based frameworks for the theoretical interpretation of these fundamental N* parameters. Resonance electrocouplings will be measured for the first time at distance scales where quark degrees of freedom are expected to dominate. These studies will focus on the exploration of quark interactions in the strong QCD running coupling regime, that are responsible for the baryon formation. They are vital in order to understand how the complexity of non-perturbative strong interactions emerges from QCD and, in particular, to explore confinement in the baryon sector.

The scope of this three-day workshop focuses particularly on the development of future strategies, methods, and approaches to extract the γvNN* electrocouplings where hard quark interactions become relevant and on the interpretation of hadronic physics in this non-perturbative regime. The workshop aims to foster already initiated efforts and create opportunities to facilitate and stimulate further growth in this field.

Program topics will include:

  1. Phenomenological reaction model for the extraction of the γvNN* electrocouplings in single and double meson electroproduction up to high W and Q2
  2. Quark degrees of freedom in exclusive single and double meson electroproduction in the resonance region at 5GeV2 < Q2 < 10 GeV2
  3. N* structure from LQCD
  4. Light cone sum rules and N* electrocouplings
  5. N* structure from the Dyson-Schwinger Equations of QCD
  6. Quark models describing the N* structure and their QCD motivation


The goal of this workshop is to define and/or update commitments, refine the scope, and to establish a timeline of major milestones in experiment, analysis, and interpretation.

List of confirmed and conditionally confirmed speakers:

Vladimir Braun
Stan Brodsky
Volker Burkert
Ian Cloet
Mauro Giannini
Ralf Gothe
Franz Gross
Siegfried Krewald
Jean-Marc Laget
Wally Melnitchouk
Viktor Mokeev
Craig Roberts
Elena Santopinto
Toru Sato
Guy de Teramond
Lothar Tiator
Christian Weiss

Looking forward to see you in South Carolina in August 2012,

Local Organizing Committee:

R.W. Gothe, USC (co-chair)
V.I. Mokeev, JLab (co-chair)
V.D. Burkert, JLab
T-S.H. Lee, ANL
C.D. Roberts, ANL
Ch. Weiss, JLab

PS.: Our three-day workshop follows directly after a graduate student summer school on "Dyson-Schwinger Equations to tackle non-perturbative physics, their applications in Quantum Chromodynamics and condensed matter physics, and their mathematical connection to the Hopf algebras", which will be held at USC from July 26 to August 11. Our main lecturers are Piers Coleman, Ian Cloet, Craig Roberts, and Karen Yeats. There will be a limited number of spots for outside graduate students available. If you would like to send a graduate student or know one who would like to come please contact me ( directly.