We study the process e^+e^- → J/ψπ^+π^- with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BABAR detector at center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454 fb^(-1). We investigate the J/ψ π^+π^- mass distribution in the region from 3.5 to 5.5 GeV/c^2. Below 3.7 GeV/c^2 the ψ(2S) signal dominates, and above 4 GeV/c^2 there is a significant peak due to the Y(4260). A fit to the data in the range 3.74–5.50 GeV/c^2 yields a mass value 4245±5(stat)±4(syst) MeV/c^2 and a width value 114_(-15)^(+16)(stat)±7(syst) MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01 GeV/c^2...
We study the processes e+e-→π+π-π0π0π0γ and π+π-π0π0ηγ in which an energetic photon is radiated from...
We study the processes e^+e^- → K^+K^-π^+π^-γ, K^+K^-π^0π^0 γ, and K^+K^-K^+K^- γ, where the photon ...
We study the processes eþe− → 2ðπþπ−Þπ0π0π0γ and 2ðπþπ−Þπ0π0ηγ in which an energetic photon is radia...
We study the process e^+ e^− →ψ(2S)π^+ π^− with initial-state-radiation events produced at the PEP-I...
We study the process e^+e^-→π^+π^-π^+π^-γ, with a photon emitted from the initial-state electron or ...
We study the rare B meson decays B±,0→J/ψK+K-K±,0, B±,0→J/ψφK±,0, and search for B0→J/ψφ, using 469×...
The process e+e− → π+π−π0γ is studied at a center-of-mass energy near the ϒ(4S) resonance using a da...
The process e+e-→π+π-π0γ is studied at a center-of-mass energy near the D(4S) resonance using a data...
We study the process e(+)e(-) -> psi(2S)pi(+)pi(-) with initial-state-radiation events produced at t...
We report a study of the process γγ → X → η_cπ^+π^-, where X stands for one of the resonances χ_(c2)...
We study the processes e + e − → K 0 S K 0 L γ , K 0 S K 0 L π + π − γ , K 0 S K 0 S π + π − γ , and...
We study the processes e+e-→2(π+π-)π0π0π0γ and 2(π+π-)π0π0ηγ in which an energetic photon is radiate...
We report the observation of e + e − → ϕ η near √ s = 10.58 GeV with 6.5 σ significance in the K...
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected wit...
We study the processes e^+e^− → K^0_SK^0_Lγ, K^0_SK^0_Lπ^+π^−γ, K^0_SK^0_Sπ^+π^−γ, and K^0_SK^0_SK^+...
We study the processes e+e-→π+π-π0π0π0γ and π+π-π0π0ηγ in which an energetic photon is radiated from...
We study the processes e^+e^- → K^+K^-π^+π^-γ, K^+K^-π^0π^0 γ, and K^+K^-K^+K^- γ, where the photon ...
We study the processes eþe− → 2ðπþπ−Þπ0π0π0γ and 2ðπþπ−Þπ0π0ηγ in which an energetic photon is radia...
We study the process e^+ e^− →ψ(2S)π^+ π^− with initial-state-radiation events produced at the PEP-I...
We study the process e^+e^-→π^+π^-π^+π^-γ, with a photon emitted from the initial-state electron or ...
We study the rare B meson decays B±,0→J/ψK+K-K±,0, B±,0→J/ψφK±,0, and search for B0→J/ψφ, using 469×...
The process e+e− → π+π−π0γ is studied at a center-of-mass energy near the ϒ(4S) resonance using a da...
The process e+e-→π+π-π0γ is studied at a center-of-mass energy near the D(4S) resonance using a data...
We study the process e(+)e(-) -> psi(2S)pi(+)pi(-) with initial-state-radiation events produced at t...
We report a study of the process γγ → X → η_cπ^+π^-, where X stands for one of the resonances χ_(c2)...
We study the processes e + e − → K 0 S K 0 L γ , K 0 S K 0 L π + π − γ , K 0 S K 0 S π + π − γ , and...
We study the processes e+e-→2(π+π-)π0π0π0γ and 2(π+π-)π0π0ηγ in which an energetic photon is radiate...
We report the observation of e + e − → ϕ η near √ s = 10.58 GeV with 6.5 σ significance in the K...
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected wit...
We study the processes e^+e^− → K^0_SK^0_Lγ, K^0_SK^0_Lπ^+π^−γ, K^0_SK^0_Sπ^+π^−γ, and K^0_SK^0_SK^+...
We study the processes e+e-→π+π-π0π0π0γ and π+π-π0π0ηγ in which an energetic photon is radiated from...
We study the processes e^+e^- → K^+K^-π^+π^-γ, K^+K^-π^0π^0 γ, and K^+K^-K^+K^- γ, where the photon ...
We study the processes eþe− → 2ðπþπ−Þπ0π0π0γ and 2ðπþπ−Þπ0π0ηγ in which an energetic photon is radia...