In a selected kinematic region, the measured cos(psi) and cos(2psi) azimuthal asymmetries of J/psi leptoproduction can separate the color-singlet model, the 1S0[8]-dominant NRQCD picture, and the equal-color-octet NRQCD scenario.
The leptonic current structure and azimuthal asymmetry in deeply inelastic scattering
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abstract
We present a compact form of the leptonic currents for the computation of the processes involving an initial virtual boson (photon, $W^{\pm}$ or $Z_0$). For deeply inelastic scattering, once the azimuthal angle of the plane expanded by the initial- and final-state leptons are integrated over in the boson-proton rest frame, the azimuthal-asymmetric terms vanish, which, however, is NOT true when some physical quantities (such as the transverse momentum of the observed particle) are specified in laboratory frame. The abuse of the symmetry may lead to wrong results.
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Statistical analysis of the azimuthal asymmetry in the $J/\psi$ leptoproduction in unpolarized $ep$ collisions
In a selected kinematic region, the measured cos(psi) and cos(2psi) azimuthal asymmetries of J/psi leptoproduction can separate the color-singlet model, the 1S0[8]-dominant NRQCD picture, and the equal-color-octet NRQCD scenario.