Transverse Spin in QCD and Transverse Polarized Deep Inelastic Scattering

Details Transverse Spin in QCD and Transverse Polarized Deep Inelastic Scattering Transverse Spin in QCD and Transverse Polarized Deep Inelastic Scattering

1999-08-20

arxiv.org/abs/hep-ph/9908424v2

Phys.Lett. B476 (2000) 471-476

Physics

High Energy Physics

High Energy Physics - Phenomenology

Title and presentation slightly changed, results unchanged, accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(00)00148-9

We address the long standing problem of the construction of relativistic spin operators for a composite system in QCD. Exploiting the kinematical boost symmetry in light front theory, we show that transverse spin operators for massless particles can be introduced in an arbitrary reference frame, in analogy with those for massive particles. In light front QCD, the complete set of transverse spin operators are identified for the first time, which are responsible for the helicity flip of the nucleon. We establish the direct connection between transverse spin in light front QCD and transverse polarized deep inelastic scattering. We discuss the theoretical and phenomenological implications of our results.

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