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Article overview
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On Electron-Positron Annihilation into Nucleon-Antinucleon Pairs | John Ellis
; Marek Karliner
; | Date: |
30 Aug 2001 | Journal: | New J.Phys. 4 (2002) 18 | Subject: | hep-ph | Affiliation: | CERN) and Marek Karliner (Tel Aviv U. | Abstract: | 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. | Source: | arXiv, hep-ph/0108259 | Services: | Forum | Review | PDF | Favorites |
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