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.

arXiv comment6 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