Transversity studies with protons and light nuclei

Abstract

A general formalism to evaluate time-reversal odd transverse momentum dependent parton distributions (T-odd TMDS) is reviewed and applied to the calculation of the leading-twist quantities, i.e., the Sivers and the Boer-Mulders functions. Two different models of the proton structure, namely a non relativistic constituent quark model and the MIT bag model, have been used. The results obtained in both frameworks fulfill the Burkardt sum rule to a large extent. The calculation of nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off transversely polarized ${}^3$He is also illustrated. It is found that the nuclear effects described by an Impulse Approximation approach are under theoretical control.

11 pages, 6 figures, invited talk at the "XIII Conference on Problems in Theoretical Nuclear Physics in Italy", Cortona, Italy, 6-8 April 2011. To be published in Journal of Physics: Conference Series

References in corpus (17)

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• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• Transverse Quark Spin Effects and the Flavor Dependence of the Boer-Mulders Function
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• Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon
• Model calculations of the Sivers function satisfying the Burkardt Sum Rule
• Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarized ${}^3$He
• Analyzing the Boer-Mulders function within different quark models
• Wilson lines in transverse-momentum dependent parton distribution functions with spin degrees of freedom
• An application of transverse-momentum-dependent evolution equations in QCD
• Non-perturbative momentum dependence of the coupling constant and hadronic models