Accessing transversity via J/Psi production in polarized p-pbar interactions
arXiv:hep-ph/0403114 · doi:10.1016/j.physletb.2004.05.029
Abstract
We discuss the possibility of a direct access to transversity distributions by measuring the double transverse spin asymmetry A_TT in p pbar --> J/Psi + X --> l^- l^+ + X processes at future GSI-HESR experiments with polarized protons and anti-protons. In the J/Psi resonance production region, with 30 < s < 45 GeV^2, both the cross-section and A_TT are expected to be sufficiently large to allow a measurement of h_1^q(x,M^2); numerical estimates are given.
10 pages, 2 figures. Version accepted for publication in PLB; comments and references added