Graugés Pous, EugeniBABAR Collaboration2019-04-042019-04-042006-11-171550-7998https://hdl.handle.net/2445/131426We study the initial-state-radiation processes e + e − → K + K − π + π − γ and e + e − → K + K − π 0 π 0 γ using an integrated luminosity of 232     fb − 1 collected at the Υ ( 4 S ) mass with the BABAR detector at SLAC. Even though these reactions are dominated by intermediate states with excited kaons, we are able to study for the first time the cross section for e + e − → ϕ ( 1020 ) f 0 ( 980 ) as a function of center-of-mass energy. We observe a structure near threshold consistent with a 1 −− resonance with mass m = 2.175 ± 0.010 ± 0.015     GeV / c 2 and width Γ = 58 ± 16 ± 20     MeV . We observe no Y ( 4260 ) signal and set a limit of B Y → ϕ π + π − ⋅ Γ Y e e < 0.4     eV (90% confidence level), which excludes some models.9 p.application/pdfeng(c) American Physical Society, 2006Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5516722019-04-04info:eu-repo/semantics/openAccess