Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex 2e, 4 pages, 5 figures, talk delivered by A. Prokudin at the ``16th International Spin Physics Symposium'', SPIN2004, Oc
Scientific paper
The role of intrinsic $k_\perp$ in semi-inclusive Deep Inelastic Scattering (SIDIS) processes ($\ell p \to \ell h X$) is studied within QCD parton model at leading order. The resulting picture is applied to the description of the weighted single spin asymmetry $A_{UL}^{\sin\phi_h}$ measured by HERMES. It is shown that these data could be described by the Sivers mechanism alone. However, the extracted Sivers functions fail to describe the HERMES data on $A_{UT}^{\sin(\phi_h-\phi_S)}$.
Anselmino Mauro
Boglione Maria
D'Alesio Umberto
Kotzinian Aram
Murgia Francesco
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