Towards the resolution of the e+e- --> Nbar N puzzle
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.
Keywords
Cite
@article{arxiv.hep-ph/0112047,
title = {Towards the resolution of the e+e- --> Nbar N puzzle},
author = {Marek Karliner},
journal= {arXiv preprint arXiv:hep-ph/0112047},
year = {2009}
}
Comments
Invited talk at the Int. Workshop "Light-cone Physics: Particles and Strings", Trento, Sept. 3-11, 2001