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2016

Hunting the Gluon Orbital Angular Momentum at the Electron-Ion Collider

Ji, Xiangdong, Yuan, Feng, Zhao, Yong

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Applying the connection between the parton Wigner distribution and orbital angular momentum (OAM), we investigate the probe of the gluon OAM in hard scattering processes at the planned electron-ion collider.

We show that the single longitudinal target-spin asymmetry in the hard diffractive dijet production is very sensitive to the gluon OAM distribution.
The associated spin asymmetry leads to a characteristic azimuthal angular correlation of $\sin(\phi_q -\phi_\Delta)$, where $\phi_\Delta$ and $\phi_q$ are the azimuthal angles of the proton momentum transfer and the relative transverse momentum between the quark-antiquark pair.
This study will enable a first measurement of the gluon OAM in the proton spin sum rule.

Hunting the Gluon Orbital Angular Momentum at the Electron-Ion Collider · Around

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