Recent progress in the understanding of single spin asymmetries

Abstract

Over the past years a lot of progress has been made in the understanding of single spin asymmetries in hard scattering processes. We briefly review this subject, covering the non-vanishing of time-reversal odd parton distributions, universality of fragmentation functions, and the discovery of previously unknown time-reversal odd parton distributions at subleading twist. Interestingly enough, all these developments were initiated by simple model calculations.

10 pages, contribution to the Festschrift on the occasion of Klaus Goeke's 60th birthday; references added

References in corpus (24)

• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
• Time-reversal odd distribution functions in leptoproduction
• Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
• The complete tree-level result up to order $1/Q$ for polarized deep-inelastic leptoproduction
• Final state interactions and gauge invariant parton distributions
• Universality of T-odd effects in single spin and azimuthal asymmetries
• QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan Processes at Low Transverse Momentum
• Parton Distributions in Light-Cone Gauge: Where Are the Final-State Interactions?
• Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion Electro-Production
• Structure Functions are not Parton Probabilities
• Measurement of Beam-Spin Asymmetries for Deep Inelastic ${\pi }^{+}$ Electroproduction
• Gluon-Exchange in Spin-Dependent Fragmentation
• Azimuthal asymmetries at CLAS: Extraction of e^a(x) and prediction of A_{UL}
• New observables in longitudinal single-spin asymmetries in semi-inclusive DIS
• Time Reversal Odd Fragmentation Functions in Semi-Inclusive Scattering of Polarized Leptons from Unpolarized Hadrons
• Azimuthal asymmetry in electro-production of neutral pions in SIDIS
• Single-spin Azimuthal Asymmetries in the ``Reduced Twist-3 Approximation''
• The Collins function: a simple model calculation
• Lorentz invariance relations among parton distributions revisited
• Nucleon Transversity Distribution from Azimuthal Spin Asymmetry in Pion Electroproduction
• On the azimuthal asymmetries in DIS
• The Beam Single Spin Asymmetry in Semi-inclusive Deep Inelastic Scattering
• Chiral-Odd Fragmentation Functions in Single Pion Inclusive Electroproduction

Cited by in corpus (10)

• The transverse momentum dependent distribution functions in the bag model
• Sivers effect in semi-inclusive deeply inelastic scattering
• Transverse Quark Spin Effects and the Flavor Dependence of the Boer-Mulders Function
• Transverse momentum dependent distribution functions in a covariant parton model approach with quark orbital motion
• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation
• Sivers effect in Drell Yan at RHIC
• Transverse-momentum dependent parton distribution functions beyond leading twist in quark models
• The twist-three distribution $e^q(x,k_{\perp })$ in a light-front model
• Insights on non-perturbative aspects of TMDs from models
• Sivers effect in semi-inclusive DIS and in the Drell-Yan process