TMDs in the bag model

Abstract

Leading and subleading twist transverse momentum dependent parton distribution functions (TMDs) are studied in a quark model framework provided by the bag model. A complete set of relations among different TMDs is derived, and the question is discussed how model-(in)dependent such relations are. A connection of the pretzelosity distribution and quark orbital angular momentum is derived.

Comments: 6 pages with no figures. Reported at Spin Symposium 2010, Juelich, Germany and at Advanced Studies Institute on Symmetries and Spin (SPIN-Praha-2011), Prague, May 2 - 9, 2011. Will be published in The European Physical Journal Special Topics (EJP ST) Series. Style file are included. Reference is added