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Improved positivity bound for Deep Inelastic Scattering on transversely polarized nucleon

J. Soffer, O. V. Teryaev

hep-pharXiv:hep-ph/9906455

Abstract

The positivity bound for the transverse asymmetry A2 may be improved by making use of the fact, that the state of a photon and a nucleon with total spin 3/2, does not participate to the interference. The bound is therefore useful in the case of a longitudinal asymmetry small (say, at low x) or negative (like in the neuteron case).

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