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arXiv · hep-ph/0612006

Double spin azimuthal asymmetries A_{LT} and A_{LL} in semi-inclusive DIS

A. Kotzinian
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Abstract

Within the LO QCD parton model of SIDIS with unintegrated quark distribution and fragmentation functions we study the transverse momentum and azimuthal dependencies of the double spin asymmetries $A_{LT}$ and $A_{LL}$. For later we include ${\cal O}(k_{\perp}/Q)$ kinematic corrections, which induce an azimuthal modulation of the asymmetry, analogous to the Cahn effect in unpolarized SIDIS. We show that a study of these asymmetries allows to extract the transverse momentum dependence of the unintegrated helicity distribution function $g_{1L}^q(x,k_\perp)$ and $g_{1T}^q(x,k_\perp)$. This report is based on research published in [1] and [2], where predictions are given for ongoing COMPASS, HERMES and JLab experiments.

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A. Kotzinian. 2006-12-01. Double spin azimuthal asymmetries A_{LT} and A_{LL} in semi-inclusive DIS. https://doi.org/10.1063/1.2750826

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