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arXiv · 2501.05092

Spin-orbit correlation and spatial distributions for spin-0 hadrons

Cédric Lorcé·Qin-Tao Song
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Abstract

The spin-orbit correlation in spin-0 hadrons can be investigated through the kinetic energy-momentum tensor form factor $\tilde F^q(t)$. We observe that the latter is also related to a torque about the radial direction, which we interpret as a chiral stress. If we neglect the quark mass contribution, then $\tilde F^q(t)$ is simply proportional to the electromagnetic form factor for spin-0 hadrons, and the spin-orbit correlation is equal to minus half of the valence quark number. Given the extensive studies on the electromagnetic form factor for spin-0 hadrons such as pions, kaons, and the $\alpha$ particle, we present the spatial distributions of chiral stress and kinetic spin-orbit correlation based on current parametrizations of the pion electromagnetic form factor.

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Cédric Lorcé, Qin-Tao Song. 2025-01-09. Spin-orbit correlation and spatial distributions for spin-0 hadrons. https://doi.org/10.1016/j.physletb.2025.139433

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