Chiral perturbation theory and vector mesons in e+e-→π0γ and π0+-

A. Bramon, A. Grau, G. Pancheri

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The low-energy cross-section for e+e-→π0γ is predicted in χPT at next-to-leading order and the saturation of its counter-terms by vector-meson resonances is confirmed. Further details on this saturation by vector mesons are discussed for e+e-→π0μ+μ -. Cross-sections are predicted from threshold up to the ω-mass region for different choices of the relevant parameters in the lagrangian. It is suggested that measurements of these cross-sections at low-energy high luminosity e+e- machines, like DAPHNE, will allow to distinguish between different sets of parameters. © 1992.
Original languageEnglish
Pages (from-to)353-358
JournalPhysics Letters B
Issue number3
Publication statusPublished - 5 Mar 1992


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