Towards the resolution of the e+e- → N N puzzle

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Abstract

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)/σ(e+e- → p̄p) can be understood quantitatively in this picture.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalNuclear Physics B - Proceedings Supplements
Volume108
DOIs
StatePublished - Apr 2002

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