Spin-independent and double-spin cos(phi) asymmetries in semi-inclusive pion electroproduction
Abstract
We consider the cos(phi) dependence of the longitudinal double-spin asymmetry for charged pion electroproduction in semi-inclusive deep inelastic scattering, emphasizing intrinsic transverse momentum effects. This azimuthal asymmetry allows to measure the cos(phi) moments of the unpolarized and double-spin cross-section, simultaneously. The size of the asymmetry, in the approximation where all twist-3 interaction-dependent distribution and fragmentation functions are set to zero, is estimated for HERMES kinematics; both the spin-independent and the double-spin cos(phi) moments are predicted to be sizeable and negative.
Keywords
Cite
@article{arxiv.hep-ph/0208208,
title = {Spin-independent and double-spin cos(phi) asymmetries in semi-inclusive pion electroproduction},
author = {K. A. Oganessyan and L. S. Asilyan and M. Anselmino and E. De Sanctis},
journal= {arXiv preprint arXiv:hep-ph/0208208},
year = {2009}
}
Comments
LaTeX, 4 pages, 4 figures. Discussion on the acceptance effects added; recent parameterizations of distribution and fragmentation functions used, figures replaced. Final version to appear in Physics Letters B