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Quark and Glue Components of the Proton Spin from Lattice Calculation

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.

preprint2015arXivOpen access
Keh-Fei Liu
hep-phhep-latnucl-th
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Keh-Fei Liu

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