Potential linear and angular momentum in the scalar diquark model
High Energy Physics - Phenomenology
2021-07-21 v1
Abstract
We present an analytic two-loop calculation within the scalar diquark model of the potential linear and angular momenta, defined as the difference between the Jaffe-Manohar and Ji notions of linear and angular momenta. As expected by parity and time-reversal symmetries, a direct calculation confirms that the potential transverse momentum coincides with the Jaffe-Manohar (or canonical) definition of average quark transverse momentum, also known as the quark Sivers shift. We examine whether initial/final-state interactions at the origin of the Sivers asymmetry can also generate a potential angular momentum in the scalar diquark model.
Cite
@article{arxiv.2010.13451,
title = {Potential linear and angular momentum in the scalar diquark model},
author = {David Arturo Amor-Quiroz and Matthias Burkardt and William Focillon and Cédric Lorcé},
journal= {arXiv preprint arXiv:2010.13451},
year = {2021}
}
Comments
20 pages, 6 figures