Notes on the orbital angular momentum of quarks in the nucleon

Details Notes on the orbital angular momentum of quarks in the nucleon Notes on the orbital angular momentum of quarks in the nucleon

2011-11-15

arxiv.org/abs/1111.3547v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages; v2. added comments and references on the Wigner distribution approach; v3. improved presentation, to appear in Phys.

Scientific paper

We discuss the orbital angular momentum of partons inside a longitudinally
polarized proton in the recently proposed framework of spin decomposition. The
quark orbital angular momentum defined by Ji can be decomposed into the
`canonical' and the `potential' angular momentum parts, both of which are
represented as the matrix element of a manifestly gauge invariant operator.

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