Anomalous Quark Chromomagnetic Moment and Single-Spin Asymmetries
Nikolai Kochelev, Nikolai Korchagin
TL;DR
This paper proposes a nonperturbative QCD mechanism involving a large anomalous quark chromomagnetic moment, which explains the unexpectedly large single-spin asymmetries observed in high-energy hadronic reactions.
Contribution
It introduces a novel nonperturbative mechanism based on the QCD vacuum's topological structure to account for large SSA in high-energy processes.
Findings
AQCM generates large SSA at the quark level
Mechanism can explain observed large SSA in experiments
Estimations support the significance of AQCM in spin asymmetries
Abstract
We discuss a nonperturbative mechanism for the single-spin asymmetries (SSA) in the strong interaction. This mechanism is based on the existence of a large anomalous quark chromomagnetic moment (AQCM) induced by the nontrivial topological structure of QCD vacuum. Our estimations within the instanton liquid model for QCD vacuum show that AQCM generates very large SSA on the quark level. Therefore, this mechanism can be responsible for the anomalously large SSA observed in different high energy reactions with hadrons.
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