Orbital Angular Momentum: How to Define it and How to Measure it
Imperial College London
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Published online: 23 January 2015
In the context of the controversy concerning the ambiguities in the definition of quark and gluon angular momentum we explain pedagogically the origin of these ambiguities and stress that there are fundamentally only three physically relevant variants. We give precise expressions for the sum rules involving them. We consider their measurement, both experimentally and on the lattice, and discuss some attempts to calculate them in models.
© Owned by the authors, published by EDP Sciences, 2015
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