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.
|Titolo:||Study of e+e-→pp¯ using initial state radiation with BABAR|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1103/PhysRevD.73.012005|
|Appare nelle tipologie:||01 - Articolo su periodico|