Nucleon Helicity in Pion Photoproduction

Details Nucleon Helicity in Pion Photoproduction Nucleon Helicity in Pion Photoproduction

1995-09-13

arxiv.org/abs/hep-ph/9509289v1

Phys.Rev.C52:3499-3501,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

plain tex, 6 pages, 8 figures

Scientific paper

10.1103/PhysRevC.52.3499

Pion-photoproduction data is examined to check for the nucleon-helicity conservation predicted by asymptotic QCD. The differential cross section shows agreement with constituent-counting rules, and polarization data is not in disagreement with conservation of nucleon helicity. However large uncertainties in the polarization measurements do not allow a conclusive statement. The helicity amplitudes from a partial-wave analysis are also examined for helicity conservation. While the amplitudes become small as $s$ increases, the $s$ dependence of the helicity-conserving amplitudes is similar to the dependence of the non-conserving amplitudes.

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