A New Mechanism for Single Spin Asymmetries in Strong Interactions

Abstract

It is shown that the contribution of the instantons to the fragmentation of quarks leads to the appearance of a imaginary part in diagrams of quark-quark scattering at large transfer momentum. The imaginary part comes from the analytical continuation of the instanton amplitudes from Euclidean to Minkowsky space-time and reflects quasiclassical origin of instanton solution of QCD equations of motion. This phenomenon and instanton--induced quark spin-flip give a new nonperturbative mechanism for the observed anomalous single-spin asymmetries in hadron-hadron and lepton-hadron interactions.

8 pages, 3 figures, Latex; final version to appear in JETP Lett

References in corpus (3)

• Time-reversal odd distribution functions in leptoproduction
• Topological Structure of the SU(3) Vacuum
• Instantons and Polarized Structure Functions

Cited by in corpus (10)

• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• The Collins function: a simple model calculation
• Instanton contribution to the Sivers function
• Instanton-induced Azimuthal Spin Asymmetry in Deep Inelastic Scattering
• Anomalous Quark Chromomagnetic Moment and Single-Spin Asymmetries
• Single Spin Asymmetry through QCD Instantons
• Spin Physics through QCD Instantons
• Anomalous pion production induced by nontrivial topological structure of QCD vacuum
• Double Spin Asymmetries through QCD Instantons
• P-Odd Pion Azimuthal Charge Correlations in Heavy Ion Collisions