Instanton-induced Azimuthal Spin Asymmetry in Deep Inelastic Scattering

Abstract

It is by now well understood that spin asymmetry in deep inelastic scattering (DIS) can appear if two things are both present: (i) a chirality flip of the struck quark; (ii) a nonzero T-odd phase due to its final state interaction. So far (i) was attributed to a new structure/wave function of the nucleon and (ii) to some gluon exchanges. We propose a new mechanism utilizing strong vacuum fluctuations of the gluon field described semiclasically by instantons, and show that both (i) and (ii) are present. The magnitude of the effect is estimated using known parameters of the instanton ensemble in the QCD vacuum and known structure and fragmentation functions, without any new free parameters. The result agrees in sign and (roughly) in magnitude with the available data on single particle inclusive DIS. Furthermore, our predictions uniquely relate effects for longitudinally and transversely polarized targets.

version 2 includes few refs and new fig.5 which contains comparison to recent data

References in corpus (2)

• Insight into nucleon structure from lattice calculations of moments of parton and generalized parton distributions
• Instantons and the Spin of the Nucleon

Cited by in corpus (16)

• Confining Dyon-Anti-Dyon Coulomb Liquid Model I
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• Instanton contribution to the Sivers function
• Anomalous Quark Chromomagnetic Moment and Single-Spin Asymmetries
• Single Spin Asymmetry through QCD Instantons
• Spin Physics through QCD Instantons
• Gluonic Structure of the Constituent Quark
• Anomalous pion production induced by nontrivial topological structure of QCD vacuum
• The Pauli Form Factor of Quark and Nontrivial Topological Structure of the QCD
• Double Spin Asymmetries through QCD Instantons
• Mechanism of single-spin asymmetries generation in the inclusive hadron processes
• P-Odd Pion Azimuthal Charge Correlations in Heavy Ion Collisions
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings
• Sivers effect in semi-inclusive DIS and in the Drell-Yan process
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering