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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. 2022 Jul 22;129(4):042001. doi: 10.1103/PhysRevLett.129.042001.
Based on (10087±44)×10^{6} J/ψ events collected with the BESIII detector, the process J/ψ→γπ^{+}π^{-}η^{'} is studied using two largest decay channels of the η^{'} meson, η^{'}→γπ^{+}π^{-} and η^{'}→ηπ^{+}π^{-}, η→γγ. A new resonance, which we denote as the X(2600), is observed with a statistical significance larger than 20σ in the π^{+}π^{-}η^{'} invariant mass spectrum, and it has a connection to a structure around 1.5 GeV/c^{2} in the π^{+}π^{-} invariant mass spectrum. A simultaneous fit on the π^{+}π^{-}η^{'} and π^{+}π^{-} invariant mass spectra with the two η^{'} decay modes indicates that the mass and width of the X(2600) state are 2618.3±2.0_{-1.4}^{+16.3} MeV/c^{2} and 195±5_{-17}^{+26} MeV, where the first uncertainties are statistical, and the second systematic.
基于北京谱仪III（BESIII）探测器收集的（10087±44）×10⁶个J/ψ事例，利用η′介子的两个最大衰变道η′→γπ⁺π⁻和η′→ηγπ⁺π⁻、η→γγ，对过程J/ψ→γπ⁺π⁻η′进行了研究。在π⁺π⁻η′不变质量谱中观测到一个新的共振态，我们将其记为X（2600），其统计显著性大于20σ，并且它与π⁺π⁻不变质量谱中1.5 GeV/c²附近的一个结构有关。对具有两种η′衰变模式的π⁺π⁻η′和π⁺π⁻不变质量谱进行同时拟合表明，X（2600）态的质量和宽度分别为2618.3±2.0₋₁.₄⁺¹⁶.₃ MeV/c²和195±5₋₁₇⁺²⁶ MeV，其中第一个不确定度为统计不确定度，第二个为系统不确定度。
