Quark and Glue Components of the Proton Spin from Lattice Calculation
arXiv:1504.06601 · doi:10.1142/S2010194516600053
Abstract
The status of lattice calculations of the quark spin, the quark orbital angular momentum, the glue angular momentum and glue spin in the nucleon is summarized. The quark spin calculation is recently carried out from the anomalous Ward identity with chiral fermions and is found to be small mainly due to the large negative anomaly term which is believed to be the source of the `proton spin crisis'. We also present the first calculation of the glue spin at finite nucleon momenta.
Plenary talk presented at SPIN2014, the 21st International Symposium on Spin Physics, 16 pages, 6 figures, references added and typos corrected. arXiv admin note: text overlap with arXiv:1504.04052
References in corpus (15)
- Extraction of Spin-Dependent Parton Densities and Their Uncertainties
- Evidence for polarization of gluons in the proton
- Reply to the Comment on "Spin and orbital angular momentum in gauge theories: Nucleon spin structure and multipole radiation revisited" [PRL 100:232002 (2008)]
- Spin and orbital angular momentum in gauge theories: Nucleon spin structure and multipole radiation revisited
- Conservation of the spin and orbital angular momenta in electromagnetism
- Do gluons carry half of the nucleon momentum?
- The RHIC SPIN Program: Achievements and Future Opportunities
- Moments of nucleon generalized parton distributions from lattice QCD
- Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon
- New analysis concerning the strange quark polarization puzzle
- Quasi-parton distribution functions: a study in the diquark spectator model
- Classical Limits of Scalar and Tensor Gauge Operators Based on the Overlap Dirac Matrix
- Quark and Glue Momenta and Angular Momenta in the Proton --- a Lattice Calculation
- Quark Spin in Proton from Anomalous Ward Indentity
- Glue Spin in The Longitudinally Polarized Nucleon