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Towards the resolution of the e+e- --> Nbar N puzzle | Marek Karliner
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4 Dec 2001 | Journal: | Nucl.Phys.Proc.Suppl. 108 (2002) 84-90 | Subject: | hep-ph | Affiliation: | 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) is somewhat greater than 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- --> pbar p) can be understood quantitatively in this picture. | Source: | arXiv, hep-ph/0112047 | Services: | Forum | Review | PDF | Favorites |
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