The on-going analysis of the transverse target (AUT) moments of the non-collinear cross section for SIDIS dihadron production at Hermes is discussed. These moments access the transversity (h1), pretzelocity (h1T⊥), and Sivers (f1T⊥) distribution functions convoluted with the unpolarized (D1) and Collins (H1) dihadron fragmentation functions. This measurement allows greater insight into the flavor decomposition and factorization of these functions. Additionally, the results will test the Lund/Artru fragmentation model, which predicts a sign change in the Collins function between pseudo-scalar mesons and certain partial waves of vector mesons. In preparation for this analysis, a new Monte Carlo generator has been written, and non-collinear fragmentation functions have been computed in a spectator model. Additionally, an alternate partial wave expansion is presented, providing a complementary interpretation of the fragmentation functions and allowing computation of the next-to-leading twist cross section.
ASJC Scopus subject areas
- Physics and Astronomy(all)