EMP


Exclusive Meson Production and Short-Range Hadron Structure
January 22-24, 2015
Thomas Jefferson National Accelerator Facility
Newport News, VA

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Circular

Exclusive meson production processes at high momentum transfer are an essential tool in mapping the nucleon's generalized parton distributions (GPDs) and exploring other aspects of short-range hadron structure (correlations, angular momentum). They complement the information obtained from deeply-virtual Compton scattering by probing specific spin/flavor components of the GPDs and can measure structures that are difficult to access otherwise (gluons, transversity). Substantial progess has been made in the QCD-based theory and analysis of meson production in the last few years, especially in probing quark transversity with pi0 and eta, and gluonic structure with phi and J/psi. A program of targeted experiments in hard exclusive meson production will be performed at JLab with the 12 GeV Upgrade in Hall A, Hall B (CLAS12) and Hall C. The aims of the workshop are to:

  • Identify outstanding issues in hadron structure that can be addressed with exclusive meson production at high Q2 and/or high t;
  • Review the experimental tools (detection, polarization, L/T separation) available at JLab12 and the needs for further development;
  • Discuss theoretical approaches to exclusive meson production, new ideas, and directions for further theoretical studies;
  • Identify synergies and complementarity between already approved experiments, also between DVCS and meson production.

 

Topics include:

  • Mechanism of high-Q2 meson production in QCD and experimental tests
  • Exclusive pi0, eta and quark transversity GPDs
  • Exclusive pi+, K+ and meson form factors
  • L/T separation at JLab with 11 GeV
  • Exclusive rho0, rho+, omega and their interpretation
  • Exclusive phi, J/psi and gluonic structure
  • Polarization observables for pseudoscalar and vector mesons
  • Novel QCD approaches to high-t processes
  • Backward meson production and applications

 

Organizers:

F.-X. Girod (JLab)
T. Horn (Catholic U.)
Ch. Hyde (Old Dominion U.)
V. Kubarovsky (JLab)
P. Stoler (Rensselaer Polytechnical I.)
Ch. Weiss (JLab)