Spin and Polarization in High-Energy Hadron-Hadron and Lepton-Hadron Scattering
arXiv:2011.06432 · doi:10.3390/sym12111784
Abstract
The role of spin degrees of freedom in high-energy hadron-hadron and lepton-hadron scattering is reviewed with emphasis on the dominant role of soft, diffractive, non-perturbative effects. Explicit models based on analyticity and Regge-pole theory, including the pomeron trajectory (gluon exchange in the channel) are discussed. We argue that there is a single, universal pomeron in Nature, manifest as relatively "soft" or "hard", depending on the kinematics considered. Regge trajectories are non-linear, complex functions, predicting a finite number of resonances. Explicit models and fits are presented that may be used in recovering generalized parton distributions from deeply virtual Compton scattering and electoproduction of vector mesons.
arXiv comment25 pages, 17 figures. arXiv admin note: text overlap with arXiv:1312.5683
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