Improved positivity bound for Deep Inelastic Scattering on transversely polarized nucleon
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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