Spin densities in the transverse plane and generalized transversity distributions

Details Spin densities in the transverse plane and generalized transversity distributions Spin densities in the transverse plane and generalized transversity distributions

2005-04-20

arxiv.org/abs/hep-ph/0504175v1

Eur.Phys.J.C44:87-101,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 6 eps-figures

Scientific paper

10.1140/epjc/s2005-02342-6

We show how generalized quark distributions in the nucleon describe the density of polarized quarks in the impact parameter plane, both for longitudinal and transverse polarization of the quark and the nucleon. This density representation entails positivity bounds including chiral-odd distributions, which tighten the known bounds in the chiral-even sector. Using the quark equations of motion, we derive relations between the moments of chiral-odd generalized parton distributions of twist two and twist three. We exhibit the analogy between polarized quark distributions in impact parameter space and transverse momentum dependent distribution functions.

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