New observables in longitudinal single-spin asymmetries in semi-inclusive DIS
arXiv:hep-ph/0405154 · doi:10.1016/j.physletb.2004.06.052
Abstract
We analyze longitudinal beam and target single-spin asymmetries in semi-inclusive deep inelastic scattering and in jet deep inelastic scattering, including all possible twist-3 contributions as well as quark mass corrections. We take into account the path-ordered exponential in the soft correlators and show that it leads to the introduction of a new distribution and a new fragmentation function contributing to the asymmetries.
8 pages