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Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2017 Mar 3;118(9):092001. doi: 10.1103/PhysRevLett.118.092001. Epub 2017 Mar 1.
The cross section for the process e^{+}e^{-}→π^{+}π^{-}J/ψ is measured precisely at center-of-mass energies from 3.77 to 4.60 GeV using 9 fb^{-1} of data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in a fit to the cross section. The first resonance has a mass of (4222.0±3.1±1.4) MeV/c^{2} and a width of (44.1±4.3±2.0) MeV, while the second one has a mass of (4320.0±10.4±7.0) MeV/c^{2} and a width of (101.4_{-19.7}^{+25.3}±10.2) MeV, where the first errors are statistical and second ones are systematic. The first resonance agrees with the Y(4260) resonance reported by previous experiments. The precision of its resonant parameters is improved significantly. The second resonance is observed in e^{+}e^{-}→π^{+}π^{-}J/ψ for the first time. The statistical significance of this resonance is estimated to be larger than 7.6σ. The mass and width of the second resonance agree with the Y(4360) resonance reported by the BABAR and Belle experiments within errors. Finally, the Y(4008) resonance previously observed by the Belle experiment is not confirmed in the description of the BESIII data.
利用在北京正负电子对撞机Ⅱ（BEPCII）储存环上运行的北京谱仪Ⅲ（BESIII）探测器收集的9飞靶（fb⁻¹）数据，精确测量了质心能量在3.77至4.60 GeV范围内的e⁺e⁻→π⁺π⁻J/ψ过程的截面。在对截面进行拟合时观察到两个共振结构。第一个共振态的质量为(4222.0±3.1±1.4) MeV/c²，宽度为(44.1±4.3±2.0) MeV，而第二个共振态的质量为(4320.0±10.4±7.0) MeV/c²，宽度为(101.4₋₁₉.₇⁺₂₅.₃±10.2) MeV，其中第一个误差为统计误差，第二个为系统误差。第一个共振态与先前实验报道的Y(4260)共振态相符，其共振参数的精度得到了显著提高。第二个共振态是在e⁺e⁻→π⁺π⁻J/ψ过程中首次观测到的，该共振态的统计显著性估计大于7.6σ。第二个共振态的质量和宽度在误差范围内与BABAR和Belle实验报道的Y(4360)共振态相符。最后，BESIII数据的描述中未证实Belle实验先前观测到的Y(4008)共振态。
