E. Aschenauer
Brookhaven National Laboratory

H. Avakian
Jefferson Laboratory

B. Pasquini
University of Pavia

P. Schweitzer
University of Connecticut

Program Coordinator:
Laura Lee
(206) 685-3509


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INT Workshop INT-14-55W

Studies of 3D Structure of Nucleon

February 24-28, 2014


3D parton distribution functions have been widely recognized as key objects to gain new insights on the QCD-dynamics inside hadrons. This includes generalized parton distribution functions (GPDs) containing information on the transverse spatial distributions of partons, and transverse momentum dependent distribution functions (TMDs) containing the complementary momentum space information.

In recent years a significant amount of data on spin-azimuthal observables from polarized lepton-nucleon scattering, polarized hadron-hadron collisions and electron-positron annihilations has been provided by several collaborations, including HERMES, COMPASS, BELLE, BaBar, Halls A, B and C at JLab and PHENIX and STAR at RHIC (BNL). After the first few years of running of JLab12 and the upcoming polarized pp runs at RHIC, a significantly greater set of data will be available. Although the interest in TMDs and GPDs has grown enormously we are still in need of fresh theoretical and phenomenological ideas.

The development of reliable and model independent techniques is required, especially for the extraction of TMDs and fragmentation functions from the experimental observables. A precise mapping of the 3D nucleon structure and a detailed flavor decomposition of 3D parton distribution functions are the ultimate goals.

The key questions in the field of the transverse parton structure of hadrons to be addressed by the workshop include:

  • QCD issues associated with the 3D structure
  • Framework for the extraction of 3D parton distributions
  • MC generators for global analysis of TMDs and GPDs
  • Phenomenology of 3D parton distribution and fragmentation functions
  • Factorization issues in hadron production from hadronic reactions

We plan to have a detailed discussion on basic ingredients needed for a generic MC containing spin-orbit correlations and quark-gluon interactions, with theory talks in the morning and presentations related to MC generators and experimental analysis of 3D structure in the afternoon sessions. The program will focus on a unified approach on evolution and extraction of TMDs from high to low x and from low to high Q and will address the question how to extract underlying 3D parton distribution and fragmentation functions from the wealth of data expected from semi-inclusive deep-inelastic scattering, Drell-Yan processes, proton-proton collisions and electron-positron annihilations.