Bhattacharya Shohini, Boussarie Renaud, Hatta Yoshitaka
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France.
Phys Rev Lett. 2022 May 6;128(18):182002. doi: 10.1103/PhysRevLett.128.182002.
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 cosϕ 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.
我们提出了一种用于实验探测构成质子自旋求和规则的胶子轨道角动量（OAM）的新型可观测量。我们考虑了电子 - 质子散射中排他性双喷注产生的纵向双自旋不对称性，并证明散射电子和质子之间的cosϕ方位角关联是小x处胶子OAM及其与胶子螺旋度相互作用的灵敏探针。我们还给出了电子 - 离子对撞机运动学截面的数值估计。
