Collins and Sivers effects in p(transv. polarized) p --> jet pion X: Universality and process dependence

Abstract

In this paper we briefly review the transverse momentum dependent generalized parton model and its application to the study of azimuthal asymmetries in the distribution of leading hadrons (mainly pions) inside large transverse momentum jets inclusively produced in polarized proton-proton collisions. We put particular emphasis on the phenomenological interest of these observables, in combination with similar asymmetries measured in semi-inclusive deeply inelastic scattering, Drell-Yan processes and e+e- collisions, for the study of the universality properties of the transverse momentum dependent parton distribution and fragmentation functions. We present results for RHIC kinematics at center-of-mass energies sqrt{s} = 200 and 500 GeV, for central and mainly forward jet rapidities, in particular for the Sivers distribution and the Collins fragmentation function, that are believed to be responsible of many of the largest asymmetries measured in the last years. We also briefly discuss the case of inclusive jet production and recent phenomenological applications of other theoretical approaches, like the colour gauge invariant generalized parton model and the collinear twist-three approach, aiming at clarifying the issues of the universality and process dependence of transverse momentum dependent functions.

RevTeX, 16 pages, 9 figures with 19 eps files; Invited mini-review contribution to the Special Issue on "Path Dependence in Quantum Physics: From High-Order QCD to Wilson Lines and the Breakdown of Universality", to be published in Physics of Particles and Nuclei

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Cited by in corpus (11)

• Parton Fragmentation Functions
• Collins azimuthal asymmetries of hadron production inside jets
• Probing the gluon Sivers function in $p^{\uparrow }p\to J/\psi X$ and $p^{\uparrow }p\to DX$
• Unraveling the Gluon Sivers Function in Hadronic Collisions at RHIC
• Transverse spin effects in hard semi-inclusive collisions
• TMDs and SSAs in hadronic interactions
• Testing the universality of the Collins function in pion-jet production at RHIC
• Probing the Gluon Sivers Function through direct photon production at RHIC
• Estimates for the single-spin asymmetries in $p^{\uparrow }p\to J/\psi X$ process at PHENIX RHIC and SPD NICA
• Gluon Sivers function and transverse single spin asymmetries in $e+p^{\uparrow }\to \gamma +X$
• Azimuthal asymmetries in $p^{\uparrow }p\to \mathrm{jet}\pi X$