Constraining quark angular momentum through semi-inclusive measurements

TL;DR

This paper proposes a method to estimate quark angular momentum by linking the Sivers function to generalized parton distributions, fitting experimental data to constrain the underlying physics.

Contribution

It introduces a novel approach connecting the Sivers function with GPD E to determine quark angular momentum from semi-inclusive measurements.

Findings

Successfully fit nucleon magnetic moments and single-spin asymmetries

Imposed new constraints on the Sivers function

Provided a plausible method to quantify quark angular momentum

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 at the same time nucleon magnetic moments and semi-inclusive single-spin asymmetries. This imposes additional constraints on the Sivers function and opens a plausible way to quantifying quark angular momentum.