Wigner Functions and Quark Orbital Angular Momentum
  Wigner distributions contain combined position and momentum space information of the quark distributions and are related to both generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs). We report on a recent model calculation of the Wigner distributions for the quark and their relation to the orbital angular momentum. 
Asmita Mukherjee, Sreeraj Nair, Vikash Kumar Ojha
hep-ph