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.
2011
107
182001-1
182001-6
M. Ablikim; M. N. Achasov; D. Alberto; F. F. An; Q. An; Z. H. An; J. Z. Bai; R. Baldini; Y. Ban; J. Becker; N. Berger; M. Bertani; J. M. Bian; E. Bog...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/92283
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