The e+e-→pp̅ cross section is determined over a range of pp̅ masses, from threshold to 4.5 GeV/c2, by studying the e+e-→pp̅ γ process. The data set corresponds to an integrated luminosity of 232 fb-1, collected with the BABAR detector at the PEP-II storage ring, at an e+e- center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |GE/GM|, is measured for pp̅ masses below 3 GeV/c2; its value is found to be significantly larger than 1 for masses up to 2.2 GeV/c2. We also measure J/ψ→pp̅ and ψ(2S)→pp̅ branching fractions and set an upper limit on Y(4260)→pp̅ production and decay.
Study of e(+)e(-)-> p(p)over-bar using initial state radiation with BABAR
SIMI, GABRIELE;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2006
Abstract
The e+e-→pp̅ cross section is determined over a range of pp̅ masses, from threshold to 4.5 GeV/c2, by studying the e+e-→pp̅ γ process. The data set corresponds to an integrated luminosity of 232 fb-1, collected with the BABAR detector at the PEP-II storage ring, at an e+e- center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |GE/GM|, is measured for pp̅ masses below 3 GeV/c2; its value is found to be significantly larger than 1 for masses up to 2.2 GeV/c2. We also measure J/ψ→pp̅ and ψ(2S)→pp̅ branching fractions and set an upper limit on Y(4260)→pp̅ production and decay.File in questo prodotto:
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