2016/12/07 by Xiangdong Ji, Feng Yuan, Yong Zhao · 2 citations
Physics and Astronomy · #Angular momentum #Asymmetry #Azimuth #Collider #Electron #Gluon #Heavy ion #High-Energy Particle Collisions Research #Ion #Nuclear physics #Optics #Orbital angular momentum of light #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Proton #Proton spin crisis #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Relativistic Heavy Ion Collider #Spin (aerodynamics) #Total angular momentum quantum number #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevlett.118.192004
published as Phys. Rev. Lett. 118, 192004 (2017) · 8 pages, 2 figures
arxiv created 2016/12/07 · openalex publication_date 2017/05/09 · arxiv updated 2017/05/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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(\ensuremathφq\ensuremath-\ensuremathφ_\mathrm\ensuremathΔ), where \ensuremathφ_\mathrm\ensuremathΔ and \ensuremathφq are the azimuthal angles of the proton momentum transfer and the relative transverse momentum between the quark-antiquark pair. This study may motivate a first measurement of the gluon OAM in the proton spin sum rule.