Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-12
Eur.Phys.J.A39:315-321,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 11 figures
Scientific paper
10.1140/epja/i2008-10716-1
Unexpected features of the BaBar data on e+e- in baryon-antibaryon cross sections are discussed. These data have been collected, with unprecedented accuracy, by means of the initial state radiation technique, which is particularly suitable in giving good acceptance and energy resolution at threshold. A striking feature observed in the BaBar data is the non-vanishing cross section at threshold for all these processes. This is the expectation due to the Coulomb enhancement factor acting on a charged fermion pair. In the case of e+e- in proton-antiproton it is found that Coulomb final state interactions largely dominate the cross section and the form factor is |G^p(4M^2_p)|~1, which could be a general feature for baryons. In the case of neutral baryons an interpretation of the non-vanishing cross section at threshold is suggested, based on quark electromagnetic interaction and taking into account the asymmetry between attractive and repulsive Coulomb factors. Besides strange baryon cross sections are compared to U-spin invariance predictions.
Baldini R.
Pacetti Simone
Zallo Adriano
Zichichi Antonino
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