Signature of the gluon orbital angular momentum

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 $\cos \varphi$ 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.

Version accepted for publication in Physical Review Letters

References in corpus (8)

• A first unbiased global determination of polarized PDFs and their uncertainties
• Evidence for polarization of gluons in the proton
• Generalized parton correlation functions for a spin-1/2 hadron
• Quark Wigner Distributions and Orbital Angular Momentum
• Diffractive Dijet Production and Wigner Distributions from the Color Glass Condensate
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Cited by in corpus (2)

• Energy evolution of T-odd gluon TMDs at small $x$
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects