Single spin asymmetries in inclusive high energy hadron-hadron collision processes

Abstract

It has been realized for quite a long time that single-spin experiments, in which one of the colliding objects is transversely polarized, can be helpful in studying the properties of strong interaction in general and in testing Quantum Chromodynamics (QCD) in particular. Striking effects have been observed in the past few years which deviate drastically from the expectation of the perturbative QCD parton model. These effects have received much attention. New experiments of the similar type are underway and/or planned. Different theoretical attempts have been made to understand these effects. In this review, the special role played by singly polarized high-energy hadron-hadron collisions in High Energy Spin Physics is emphasized. Characteristics of the available data for inclusive hadron productions are briefly summarized. Different theoretical approaches for such processes are reviewed with special attention to a non-perturbative model which explicitly takes the orbital motion of the valence quarks and hadronic surface effects into account. The connection between such asymmetries and hyperon polarization in unpolarized reactions is discussed. An example of the possible application of such experimental results in other processes is given.

62 pages, 17 ps-figures (Review article to appear in Inter. J. Mod. Phys. A)

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• Twist-3 Formalism for Single Transverse Spin Asymmetry Reexamined: Semi-Inclusive Deep Inelastic Scattering
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• Single-Transverse Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
• Single Transverse Spin Asymmetry for Large-p_T Pion Production in Semi-Inclusive Deep Inelastic Scattering
• Next-to-leading Order Calculation of the Single Transverse Spin Asymmetry in the Drell-Yan Process
• Three-Quark Light-Cone Amplitudes of The Proton And Quark-Orbital-Motion Dependent Observables
• Quark Correlations and Single Spin Asymmetries
• Soft-fermion-pole contribution to single-spin asymmetry for pion production in pp collisions
• Universal Structure of Twist-3 Soft-Gluon-Pole Cross Sections for Single Transverse-Spin Asymmetry
• Heavy Quarkonium Production in Single Transverse Polarized High Energy Scattering
• Single transverse-spin asymmetry for $D$-meson production in semi-inclusive deep inelastic scattering
• Single Transverse-Spin Asymmetry in Hadronic Dijet Production
• Transverse Lambda polarization in semi-inclusive DIS
• Global polarization effect and spin-orbit coupling in strong interaction
• Measurement of transverse single-spin asymmetries of ${\pi }^0$ and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions
• Feasibility Studies for Single Transverse-Spin Asymmetry Measurements at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC)
• Asymmetric Di-jet Production in Polarized Hadronic Collisions
• Single Spin Asymmetries in Heavy Quark and Antiquark Productions
• The spin alignment of vector mesons with light front quarks
• Experimental data on the single spin asymmetry and their interpretations by the chromo-magnetic string model
• Spin alignment of vector mesons in unpolarized hadron-hadron collisions at high energies
• $\bar{d}-\bar{u}$ asymmetry and semi-inclusive production of pions in DIS
• Single spin asymmetries in QCD
• Basis transformation properties of anomalous dimensions for hard exclusive processes
• Hyperon polarization in e^-p --> e^-HK with polarized electron beams
• Statistical method in quark combination model
• Hyperon Polarization in Unpolarized Scattering Processes
• Transverse momentum dependent quark distributions and polarized Drell-Yan processes
• Spin Effects in High Energy Fragmentation Processes