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Physical Review D

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Predictions for double spin asymmetry $A_{L T}$ in semiinclusive DIS

A. Kotzinian^1,2,4, B. Parsamyan^1,4, and A. Prokudin^3,4

¹Dipartimento di Fisica Generale, Università di Torino, Italy
²Yerevan Physics Institute, 375036 Yerevan, Armenia and JINR, 141980 Dubna, Russia
³Dipartimento di Fisica Teorica, Università di Torino, Italy
⁴INFN, Sezione di Torino, Via P. Giuria 1 I-10125 Torino, Italy

Phys. Rev. D 73, 114017 – Published 16 June, 2006

DOI: https://doi.org/10.1103/PhysRevD.73.114017

Abstract

In the leading order of QCD parton model of semiinclusive deep inelastic scattering (SIDIS) the double spin asymmetry $A_{L T}$ arises due to the longitudinal polarization of quarks in the transversely polarized nucleon. The corresponding $k_{T}^{2}$ weighted distribution function $g_{1 T}^{(1)}$ can be related to ordinary helicity distribution $g_{1} (x)$ measured in DIS. Using recent parametrizations for (un)polarized distribution and fragmentation functions we calculated $A_{L T}$ 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.

Article Text

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