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Updated: May 26, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Constraining quark angular momentum through semi-inclusive measurements
Alessandro Bacchetta1, Marco Radici
1Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Italy. alessandro.bacchetta@unipv.it
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.
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