Predictions for double spin asymmetry ALT in semiinclusive DIS

A. Kotzinian, B. Parsamyan, A. Prokudin

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In the leading order of QCD parton model of semiinclusive 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 parametrizations for (un)polarized distribution and fragmentation functions we calculated ALT asymmetry on transversely polarized proton and deuteron targets for different types of hadron production. The predictions are given for COMPASS, HERMES, and JLab energies. The role of Lorentz invariance relations and positivity constraints are discussed.

Original languageEnglish (US)
Article number114017
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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