title: Constraining quark angular momentum through semi-inclusive measurements.
abstract: The determination of quark angular momentum requires the knowledge of the generalized parton distribution E in the forward limit. We assume a connection between this function and the Sivers transverse-momentum distribution, based on model calculations and theoretical considerations. Using this assumption, we show that it is possible to fit nucleon magnetic moments and semi-inclusive single-spin asymmetries at the same time. This imposes additional constraints on the Sivers function and opens a plausible way to quantifying quark angular momentum.
authors.affiliation: Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy. alessandro.bacchetta@unipv.it
authors.forename: Alessandro
authors.initials: A
authors.lastname: Bacchetta
authors.forename: Marco
authors.initials: M
authors.lastname: Radici