Anomalous Quark Chromomagnetic Moment and Single-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.

Latex, 8 pages, 4 figures, references added and discussion corrected

References in corpus (8)

• Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• Sivers effect and the single spin asymmetry A_N in p(transv. pol.) p --> h X processes
• On the role of Collins effect in the single spin asymmetry A_N in p(transv. polarized) p --> h X processes
• Gluon mass generation in the presence of dynamical quarks
• Instanton contribution to the Sivers function
• Instantons in Lepton Pair Production
• Microscopic Stern-Gerlach Effect and Thomas Spin Precession as an Origin of the SSA

Cited by in corpus (13)

• Parton Fragmentation Functions
• Transverse single spin asymmetries at small x and the anomalous magnetic moment
• 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
• Anomalous Quark Chromomagnetic Moment and Dynamics of Elastic Scattering
• Double Spin Asymmetries through QCD Instantons
• 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
• Quark ACM with topologically generated gluon mass
• Gluonic Distribution in the Constituent Quark and Nucleon Induced by the Instantons
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering