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Melosh rotation: source of the proton's missing spin

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arxiv 0711.2335 v1 pith:Z4NLT3PA submitted 2007-11-15 hep-ph

classification hep-ph
keywords spinquarkslight-conemeloshprotonratherrotationconsidering
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It is shown that the observed small value of the integrated spin structure function for protons could be naturally understood within the naive quark model by considering the effect from Melosh rotation. The key to this problem lies in the fact that the deep inelastic process probes the light-cone quarks rather than the instant-form quarks, and that the spin of the proton is the sum of the Melosh rotated light-cone spin of the individual quarks rather than simply the sum of the light-cone spin of the quarks directly.

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  1. Six-dimensional light-front Wigner distributions of the proton

    hep-ph 2025-05 conditional novelty 6.0 of 10

    All 16 leading-twist six-dimensional light-front quark Wigner distributions for the proton are computed in a spectator-diquark model, extending earlier five-dimensional and unpolarized-only results.

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