In the leading order of QCD parton model of Semi Inclusive Deep Inelastic Scattering (SIDIS) the double spin asymmetry ALT arises due to the longitudinal polarization of quarks in the transversely polarized nucleon. The corresponding kT2 weighted distribution function g1T(1) can be related to ordinary helicity distribution g1(x) measured in DIS. Using recent parameterizations for (un)polarized distribution and fragmentation functions we calculated ALT asymmetry on transversely polarized proton and deuteron targets for different types hadron production. The predictions are given for COMPASS, HERMES and JLab energies. The role of Lorentz invariance relations and positivity constraints are discussed.
@article{arxiv.hep-ph/0603194,
title = {Predictions for double spin asymmetry A_{LT} in Semi Inclusive DIS},
author = {A. Kotzinian and B. Parsamyan and A. Prokudin},
journal= {arXiv preprint arXiv:hep-ph/0603194},
year = {2008}
}
Comments
The new conventional definition of asymmetry is adopted -- the factor two is added. The figures are rescaled by factor two