Hard Exclusive Electroproduction of Pseudoscalar Mesons and QCD axial anomaly

Abstract

The hard exclusive electroproduction of ${\pi }^0,\eta ,{\eta }^{\prime }$ mesons by the longitudinal photons is considered. We calculate the ratios of the ${\pi }^0:\eta :{\eta }^{\prime }$ 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.

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

References in corpus (10)

• Nonforward Parton Distributions
• Mixing and Decay Constants of Pseudoscalar Mesons
• Double distributions and evolution equations
• QCD Analysis of Unpolarized and Polarized Lambda - Baryon Production in Leading and Next-to-Leading Order
• Off-forward quark distributions of the nucleon in the large N_c limit
• Transverse Momentum and Sudakov Effects in Exclusive QCD Processes: gamma* gamma pi0 Form Factor
• Diffractive Heavy Quarkonium Photo- and Electroproduction in QCD
• Nondiagonal Parton Distributions in the Leading Logarithmic Approximation
• The effect of off-diagonal parton distributions in diffractive vector meson electroproduction
• Interpolation Formulas for the Eta-Gamma and Eta'-Gamma Transition Form Factors

Cited by in corpus (14)

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• Transversity in hard exclusive electroproduction of pseudoscalar mesons
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• The two-gluon components of the eta and eta' mesons to leading-twist accuracy
• Hard exclusive electroproduction of decuplet baryons in the large N_c limit
• Exclusive ${\pi }^0$ electroproduction at $W>2$ GeV with CLAS
• Ruling out color transparency in quasi-elastic ${}^{12}$C(e,e'p) up to $Q^2$ of 14.2 (GeV/c)${}^2$
• Exclusive $\eta$ electroproduction at $W>2$ GeV with CLAS and transversity generalized parton distributions
• Status of DVMP, DVCS and GPDs
• Hard exclusive pion leptoproduction
• Separated Response Functions in Exclusive, Forward ${\pi }^{\pm }$ Electroproduction on Deuterium
• Generalized Parton Distributions -- theoretical review --