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- W2912708056 abstract "The state Y(2175) is observed in the process e+e−→ηY(2175) with a statistical significance larger than 10 standard deviations using the data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies between 3.7 and 4.6 GeV. This is the first observation of the Y(2175) in this process. The mass and width of the Y(2175) are determined to be (2135±8±9) MeV/c2 and (104±24±12) MeV, respectively, and the production cross section (σ) of e+e−→ηY(2175)→ηϕf0(980)→ηϕπ+π− is at the several hundred femtobarn level. No significant signal for the process e+e−→η′Y(2175) is observed and the upper limit on σ(e+e−→η′Y(2175))/σ(e+e−→ηY(2175)) is estimated to be 0.43 at the 90% confidence level. We also search for ψ(3686)→ηY(2175). No significant signal is observed, indicating a strong suppression relative to the corresponding J/ψ decay, in violation of the “12% rule”.Received 14 September 2017DOI:https://doi.org/10.1103/PhysRevD.99.012014Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionHadronic decaysParticles & Fields" @default.
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