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arXiv · 1703.08322

Quark transverse spin-orbit correlations

Amit Bhoonah·Cédric Lorcé
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Abstract

We extend the study of quark spin-orbit correlations in the nucleon to the case of transverse polarization. At the leading-twist level, this completes the spin structure of the quark kinetic energy-momentum tensor. In particular, we revisit the transversity decomposition of angular momentum proposed a decade ago by Burkardt and introduce a new transverse correlation, namely between quark transversity and orbital angular momentum. We also provide for the first time the Wandzura-Wilczek expression for the second Mellin moment of twist-3 transversity generalized parton distributions, along with a new sum rule. Based on lattice calculation results, we conclude that the quark transverse spin-orbit correlation is negative for both up and down flavors, just like in the longitudinal case.

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Amit Bhoonah, Cédric Lorcé. 2017-03-24. Quark transverse spin-orbit correlations. https://doi.org/10.1016/j.physletb.2017.10.003

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