Quark spin-orbit correlations
arXiv:1409.4677 · doi:10.1142/S2010194515600368
Abstract
The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark spin-orbit correlation can also be expressed more intuitively in terms of relativistic phase-space distributions, which can be seen as the mother distributions of the standard generalized and transverse-momentum dependent parton distributions. We present here for the first time some examples of the general multipole decomposition of these phase-space distributions.
arXiv comment8 pages, 3 figures, 1 table, contribution to the proceedings of the QCD Evolution 2014 Workshop, May 12-16, Santa Fe, USA
References in corpus (23)
- Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
- Parton Physics on Euclidean Lattice
- The angular momentum controversy: What's it all about and does it matter?
- Generalized parton correlation functions for a spin-1/2 hadron
- Nucleon structure from mixed action calculations using 2+1 flavors of asqtad sea and domain wall valence fermions
- Quark Wigner Distributions and Orbital Angular Momentum
- Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data
- Notes on the orbital angular momentum of quarks in the nucleon
- The quark orbital angular momentum from Wigner distributions and light-cone wave functions
- Transverse Deformation of Parton Distributions and Transversity Decomposition of Angular Momentum
- Proton Spin Structure from Measurable Parton Distributions
- Structure analysis of the generalized correlator of quark and gluon for a spin-1/2 target
- Unified framework for generalized and transverse-momentum dependent parton distributions within a 3Q light-cone picture of the nucleon
- DVCS amplitude in the parton model
- Is gauge-invariant complete decomposition of the nucleon spin possible ?
- Parton Orbital Angular Momentum and Final State Interactions
- Twist analysis of the nucleon spin in QCD
- Twist-2 Generalized TMDs and the Spin/Orbital Structure of the Nucleon
- Wilson lines and orbital angular momentum
- Angular Momentum Decomposition for an Electron
- Measurement of Dijet Production at Low Q^2 at HERA
- Probing Parton Orbital Angular Momentum in Longitudinally Polarized Nucleon
- Spin-orbit correlations in the nucleon