The transverse angular momentum sum rule

Details The transverse angular momentum sum rule The transverse angular momentum sum rule

2008-06-30

arxiv.org/abs/0806.4879v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to TRANSVERSITY 2008, Ferrara, May 2008. 7 pages

Scientific paper

We explain the origin of the controversy about the existence of a transverse angular momentum sum rule, and show that it stems from utilizing an incorrect result in the literature, concerning the expression for the expectation values of the angular momentum operators. We demonstrate a new, short and direct way of obtaining correct expressions for these expectation values, from which a perfectly good transverse angular momentum sum rule can be deduced. We also introduce a new classification of sum rules into primary and secondary types. In the former all terms occurring in the sum rule can be measured experimentally; in the latter some terms cannot be measured experimentally.

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