Dalitz plot analyses of J/ψ → π~+ π~- π~0, J/ψ → K~+K~- π~0, and J/ψ → K_s~0 K~±π~? produced via e~+ e~- annihilation with initial-state radiation

摘要

We study the processes e~+e~- → γ_(ISR)J/ψ, where J/ψ → π~+π~-π~0, J/ψ → K~+K~-π~0, and J/ψ → K_S~0K~±π~? using a data sample of 519 fb~(-1) recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e~+e~- collider at center-of-mass energies at and near the Υ(nS) (n = 2, 3, 4) resonances. We measure the ratio of branching fractions . We perform Dalitz plot analyses of the three J/ψ decay modes and measure fractions for resonances contributing to the decays. We also analyze the J/ψ → π~+π~-π~0 decay using the Veneziano model. We observe structures compatible with the presence of ρ(1450) in all three J/ψ decay modes and measure the relative branching fraction.