Study of the reactions e^+e^− → π^+π^−π^0π^0π^0 and π^+π^−π^0π^0η at center-of-mass energies from threshold to 4.35 GeV using initial-state radiation

Abstract

We study the processes e^+e^− → π^+π^−π^0π^0π^0γ and π^+π^−π^0π^0ηγ in which an energetic photon is radiated from the initial state. The data are collected with the BABAR detector at SLAC. About 14 000 and 4700 events, respectively, are selected from a data sample corresponding to an integrated luminosity of 469  fb^(-1). The invariant mass of the hadronic final state defines the effective e^+e^− center-of-mass energy. From the mass spectra, the first precise measurement of the e^+e^− → π^+π^−π^0π^0π^0 cross section and the first measurement ever of the e^+e^− → π^+π^−π^0π^0η cross section are performed. The center-of-mass energies range from threshold to 4.35 GeV. The systematic uncertainty is typically between 10% and 13%. The contributions from ωπ^0π^0, ηπ^+π^−, and other intermediate states are presented. We observe the J/ψ and ψ(2S) in most of these final states and measure the corresponding branching fractions, many of them for the first time.

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