We present results of a study of the decay J/ψ→ωηπ+π- using a sample of (225.2±2.8)×106 J/ψ events collected by the BESIII detector, and report the observation of a new process J/ψ→ωX(1870) with a statistical significance of 7.2σ, in which X(1870) decays to a0±(980)π∓. Fitting to ηπ+π- mass spectrum yields a mass M=1877.3±6.3(stat)-7.4+3.4(syst) MeV/c2, a width Γ=57±12(stat)-4+19(syst) MeV/c2, and a product branching fraction B(J/ψ→ωX)×B(X→a0±(980)π∓)×B(a0±(980)→ηπ±)=[1.50±0.26(stat)-0.36+0.72(syst)]×10-4. Signals for J/ψ→ωf1(1285) and J/ψ→ωη(1405) are also clearly observed and measured.
eta pi(+)pi(-) Resonant Structure around 1.8 GeV/c(2) and eta(1405) in J/psi -> omega eta pi(+)pi(-)
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2011-01-01
Abstract
We present results of a study of the decay J/ψ→ωηπ+π- using a sample of (225.2±2.8)×106 J/ψ events collected by the BESIII detector, and report the observation of a new process J/ψ→ωX(1870) with a statistical significance of 7.2σ, in which X(1870) decays to a0±(980)π∓. Fitting to ηπ+π- mass spectrum yields a mass M=1877.3±6.3(stat)-7.4+3.4(syst) MeV/c2, a width Γ=57±12(stat)-4+19(syst) MeV/c2, and a product branching fraction B(J/ψ→ωX)×B(X→a0±(980)π∓)×B(a0±(980)→ηπ±)=[1.50±0.26(stat)-0.36+0.72(syst)]×10-4. Signals for J/ψ→ωf1(1285) and J/ψ→ωη(1405) are also clearly observed and measured.File in questo prodotto:
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PRL107(2011)182001 - ηπ+π- Resonant Structure around 1.8 GeVc2 and η(1405) in Jψ_ωηπ+π-.pdf
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