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We discuss the Wigner functions of the nucleon which providemulti-dimensional images of the quark distributions in phase space. Theycombine in a single picture all the information contained in the generalizedparton distributions (GPDs) and the transverse-momentum dependent partondistributions (TMDs). In particular, we present results for the distribution ofunpolarized quarks in a longitudinally polarized nucleon obtained in alight-cone constituent quark model. We show how quark orbital angular momentumcan be extracted from these distributions and compare it with alternativedefinitions given in terms of the GPDs and the TMDs.

Quark phase-space distributions and orbital angular momentum