Paper
Sivers function in light-cone quark model and azimuthal spin asymmetries in pion electroproduction
Abstract
We perform a calculation of Sivers function in a light-cone SU(6) quark-diquark model with both scalar diquark and vector diquark spectators. We derive the transverse momentum dependent light-cone wave function of the proton by taking into account the Melosh-Wigner rotation. By adopting one-gluon exchange, we obtain a non-vanishing Sivers function of quark from interference of proton spin amplitudes. We analyze the weighted Sivers asymmetries in , and electroproduction off transverse polarized proton target, averaged and not averaged by the kinematics of HERMES experiment.