arXiv:hep-ph/9809277·v4·High Energy Physics — Phenomenology

Hard Exclusive Electroproduction of Pseudoscalar Mesons and QCD axial anomaly

Michael I. Eides (Petersburg Nuclear Physics Institute, Russia, and Pennsylvania State University, USA) · Leonid L. Frankfurt (Tel Aviv University, Israel) · Mark I. Strikman (Pennsylvania State University, USA, and Deutsches Elektronen Synchrotron DESY, Germany)

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Abstract

The hard exclusive electroproduction of $π^{0}, η, η^{'}$ mesons by the longitudinal photons is considered. We calculate the ratios of the $π^{0} : η : η^{'}$ yields for the electroproduction processes off nucleons and deuterons based on the QCD factorization theorem, the low energy QCD chiral dynamics, and the QCD anomaly. Thus investigation of these ratios gives a new way to probe the physics of the spontaneous chiral symmetry breaking.

Comments: 14 pages, 2 figures, RevTeX. Discussion of the factorization is expanded, discussion of the two-photon production of the pseudoscalar mesons, references and acknowledgements are added, typos are corrected. The results of the paper are unchanged