On electron-positron annihilation into nucleon-antinucleon pairs

John Ellis, Marek Karliner

Research output: Contribution to journalArticlepeer-review


We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that σ(e+e- → n̄n) ≳ σ(e+e- → p̄p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e- and the baryon-antibaryon system. We provide evidence that the isovector channel dominates both e+e- → pions and from N̄N annihilation at rest, and show that the observed ratio of σ(e +e- → n̄n) to σ(e+e- → p̄p) can be understood quantitatively in this picture.

Original languageEnglish
Pages (from-to)18.1-18.8
JournalNew Journal of Physics
StatePublished - 25 Mar 2002


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