Sivers function in light-cone quark model and azimuthal spin asymmetries in pion electroproduction

Details Sivers function in light-cone quark model and azimuthal spin asymmetries in pion electroproduction Sivers function in light-cone quark model and azimuthal spin asymmetries in pion electroproduction

2004-06-15

arxiv.org/abs/hep-ph/0406171v1

Nucl.Phys. A741 (2004) 200-214

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 LaTex pages, 2 figures. Final version for journal publication

Scientific paper

10.1016/j.nuclphysa.2004.06.006

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 $down$ quark from interference of proton spin amplitudes. We analyze the $\frac{|P_{h\perp}|}{M}$ weighted Sivers asymmetries in $\pi^+$, $\pi^-$ and $\pi^0$ electroproduction off transverse polarized proton target, averaged and not averaged by the kinematics of HERMES experiment.

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