Using (2712.4 14.3) × 106 ψ(3686) events collected with the BESIII detector at BEPCII, a partial wave analysis of the decay ψ(3686) → ϕηη0 is performed with the covariant tensor approach. In addition to the established states h1(1900) and ϕ(2170), an axial-vector state with a mass near 2.3 GeV/c2 is observed for the first time. Its mass and width are measured to be 2316 9stat 30syst MeV/c2 and 89 15stat 26syst MeV, respectively. The product branching fractions of B(ψ(3686) → X(2300)η0) B(X(2300) → ϕη) and B(ψ(3686) → X(2300)η)B(X(2300) → ϕη0) are determined to be (4.8 1.3stat 0.7syst) × 10−6 and (2.2 0.7stat 0.7syst) × 10−6, respectively. The branching fraction B(ψ(3686) → ϕηη0) is measured for the first time to be (3.14 0.17stat 0.24syst) × 10−5. The first uncertainties are statistical and the second are systematic.
Observation of an Axial-Vector State in the Study of the Decay ψ(3686) → ϕηη0
Garzia, I.;
2025
Abstract
Using (2712.4 14.3) × 106 ψ(3686) events collected with the BESIII detector at BEPCII, a partial wave analysis of the decay ψ(3686) → ϕηη0 is performed with the covariant tensor approach. In addition to the established states h1(1900) and ϕ(2170), an axial-vector state with a mass near 2.3 GeV/c2 is observed for the first time. Its mass and width are measured to be 2316 9stat 30syst MeV/c2 and 89 15stat 26syst MeV, respectively. The product branching fractions of B(ψ(3686) → X(2300)η0) B(X(2300) → ϕη) and B(ψ(3686) → X(2300)η)B(X(2300) → ϕη0) are determined to be (4.8 1.3stat 0.7syst) × 10−6 and (2.2 0.7stat 0.7syst) × 10−6, respectively. The branching fraction B(ψ(3686) → ϕηη0) is measured for the first time to be (3.14 0.17stat 0.24syst) × 10−5. The first uncertainties are statistical and the second are systematic.| File | Dimensione | Formato | |
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PhysRevLett.134.191901 (1).pdf
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