Study ofe+e−→pp¯via initial-state radiation atBABAR

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Abstract

The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}\ensuremath{\gamma}$ is studied using $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected with the BABAR detector at the SLAC National Accelerator Laboratory, at an ${e}^{+}{e}^{\ensuremath{-}}$ center-of-mass energy of 10.6 GeV. From the analysis of the $p\overline{p}$ invariant mass spectrum, the energy dependence of the cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}$ is measured from threshold to 4.5 GeV. The energy dependence of the ratio of electric and magnetic form factors, $|{G}_{E}/{G}_{M}|$, and the asymmetry in the proton angular distribution are measured for $p\overline{p}$ masses below 3 GeV. The branching fractions for the decays $J/\ensuremath{\psi}\ensuremath{\rightarrow}p\overline{p}$ and $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}p\overline{p}$ are also determined.

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