Modeling the transverse momentum dependent parton distributions

TL;DR

This paper reviews quark model calculations of transverse momentum dependent parton distributions, highlighting model relations, T-odd effects, and comparing results with experimental data for the Collins asymmetry.

Contribution

It provides a comprehensive review of TMD calculations in quark models, including T-even and T-odd distributions, and demonstrates phenomenological agreement with experiments.

Findings

Model relations for T-even TMDs are physically motivated.

T-odd TMDs calculated with single-gluon exchange show realistic effects.

Results agree well with experimental data for Collins asymmetry.

Abstract

We review quark model calculations of the transverse momentum dependent parton distributions (TMDs). For the T-even TMDs, we discuss the physical origin of model relations which hold in a large class of quark models. For the T-odd TMDs we review results in a light-cone constituent quark model (CQM) with the final state interaction effects generated via single-gluon exchange mechanism. As phenomenological application, we show the good agreement between results in the light-cone CQM and available experimental data for the Collins asymmetry.