A Lattice Story of Proton Spin

Abstract

In this contribution, I summarized the recent Lattice QCD consensuses on the quark helicity, plus the investigations on the gluon helicity and orbital angular momenta. The preliminary non-perturbative normalized and renormalized Ji quark and gluon angular momentum results are also reported and compared with the previous 1-loop perturbative renormalized results.

arXiv comment14 pages, 10 figures, Proceedings for the 36th Annual International Symposium on Lattice Field Theory, 22-28 July 2018, Michigan State University, East Lansing, Michigan, USA. References are updated

References in corpus (24)

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• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• A first unbiased global determination of polarized PDFs and their uncertainties
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• Evidence for polarization of gluons in the proton
• Novel quark smearing for hadrons with high momenta in lattice QCD
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• Do gluons carry half of the nucleon momentum?
• Model independent extraction of the proton magnetic radius from electron scattering
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• Solutions of the Ginsparg-Wilson Relation
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• Quark contribution to the proton spin from 2+1+1-flavor lattice QCD
• Gluon Helicity Delta G from a Universality Class of Operators on a Lattice
• Strange and Charm Quark Spins from Anomalous Ward Identity
• Orbital Angular Momentum and Generalized Transverse Momentum Distribution
• Testing the Quasi-temporal Gauge on the Lattice
• The 1-loop correction of the QCD energy momentum tensor with the overlap fermion and HYP smeared Iwasaki gluon
• Proton spin in a light-cone chiral quark model