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arXiv · 2201.08709

Signature of the gluon orbital angular momentum

Shohini Bhattacharya·Renaud Boussarie·Yoshitaka Hatta
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Abstract

We propose a novel observable for the experimental detection of the gluon orbital angular momentum (OAM) that constitutes the proton spin sum rule. We consider longitudinal double spin asymmetry in exclusive dijet production in electron-proton scattering and demonstrate that the $\cos \phi$ azimuthal angle correlation between the scattered electron and proton is a sensitive probe of the gluon OAM at small-$x$ and its interplay with the gluon helicity. We also present a numerical estimate of the cross section for the kinematics of the Electron-Ion Collider.

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Shohini Bhattacharya, Renaud Boussarie, Yoshitaka Hatta. 2022-01-21. Signature of the gluon orbital angular momentum. https://doi.org/10.1103/physrevlett.128.182002

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