Ponente
Dr.
Vladimir Druzhinin
(Novosibirsk State University)
Descripción
We have used ISR technique to measure the proton magnetic form factor in the energy region from 3.0 to 6.5 GeV and charged kaon form factor in the range from 2.6 to 7.5 GeV. The proton data clearly indicate that the difference between values of time- and space-like magnetic form factors decreases with increase of energy. The kaon form factor decreases with energy faster than 1/E^2 approaching the asymptotic pQCD predictions.
We have also measured the branching fractions for the J/psi and psi decays into p anti-p and K+K- pairs. We have used our data on kaon form factor together with data from other experiments to perform model-independent determination of the relative phases between single-photon and tree-gluon amplitudes in psi -> k anti-K decays. The values of the branching fractions measured in the reaction e+e- -> K+K- are shifted relative to their actual values due to interference of resonant and non-resonant amplitudes. We have determined the absolute values of the shifts to be 5% for J/psi and 15% for psi(2S). The study has been performed using about 470 fb-1 data collected with the BABAR detector at the PEP-II e+e- collider at center-of-mass energy about 10.6 GeV.
Autor primario
fabio anulli
(INFN Rome)
