Single spin asymmetry for $p^{\uparrow }p\to \pi X$ in perturbative QCD

Abstract

Within the QCD-improved parton model and assuming the factorization theorem to hold in the helicity basis and for higher twist contributions, we show how non zero single spin asymmetries in hadron-hadron high energy and moderately large $p_T$ inclusive processes can be obtained, even in massless perturbative QCD, provided the quark intrinsic motion is taken into account. A simple model is constructed which reproduces the main features of the data on the single spin asymmetry observed in inclusive pion production in $pp$ collisions.

arXiv comment11 pages + 1 figure, plain LaTeX, figure appended as uuencoded, compressed postscript file. Revised version, to be published in Phys. Lett. B; extensive changes in Sections 1 and 2, new References added, results and conclusions essentially unchanged

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• Parton Distributions of the Proton
• Measuring transversity densities in singly polarized hadron-hadron and lepton-hadron collisions
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• Azimuthal asymmetries in semi-inclusive leptoproduction
• Hyperon Polarization in Unpolarized Scattering Processes
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• Transverse momentum dependent quark distributions and polarized Drell-Yan processes
• Sivers effect in semi-inclusive DIS and in the Drell-Yan process
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering
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