Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes

TL;DR

This paper reviews the current understanding of transverse-spin and transverse-momentum effects in high-energy hadronic reactions, covering experimental results, theoretical frameworks, and future measurement prospects.

Contribution

It provides a comprehensive overview of experimental and theoretical developments in transverse-spin and transverse-momentum phenomena in high-energy physics.

Findings

Summary of single-spin and azimuthal asymmetries in various processes

Overview of experimental results and phenomenological interpretations

Discussion of future experimental perspectives

Abstract

The state of the art concerning transverse-spin and transverse-momentum phenomena in hard hadronic reactions is reviewed. An account is given of single-spin and azimuthal asymmetries in semiinclusive deep inelastic scattering, e^+ e^- annihilation, Drell-Yan production, and hadroproduction. The ongoing experiments and the main theoretical frameworks are described in the first part of the paper. The second part is devoted to the experimental findings and their phenomenological interpretations. A brief discussion of the perspectives of future measurements is finally presented.