On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs

Details On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs

2001-08-30

arxiv.org/abs/hep-ph/0108259v1

New J.Phys.4:18,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures

Scientific paper

10.1088/1367-2630/4/1/318

We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) >~ sigma(e+e- --> pbar p). 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 Nbar N annihilation at rest, and show that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbarp p) can be understood quantitatively in this picture.

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