Quark angular momentum and the Sivers asymmetry
Alessandro Bacchetta, Marco Radici
TL;DR
This paper explores a theoretical link between the Sivers function and quark angular momentum, demonstrating how this connection can be used to fit experimental data and estimate quark angular momentum.
Contribution
It proposes a model-based assumption linking the Sivers distribution to the generalized parton distribution E, enabling simultaneous fitting of magnetic moments and asymmetries.
Findings
Successful fit of nucleon magnetic moments and single-spin asymmetries
Additional constraints on the Sivers function derived
Potential method to quantify quark angular momentum
Abstract
The determination of quark angular momentum requires the knowledge of the generalized parton distribution 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 at the same time nucleon anomalous magnetic moments and semi-inclusive single-spin asymmetries. This imposes additional constraints on the Sivers function and opens a plausible way to quantifying the quark angular momentum.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research