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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. 2020 Mar 20;124(11):112001. doi: 10.1103/PhysRevLett.124.112001.
A partial-wave analysis is performed for the process e^{+}e^{-}→K^{+}K^{-}π^{0}π^{0} at the center-of-mass energies ranging from 2.000 to 2.644 GeV. The data samples of e^{+}e^{-} collisions, collected by the BESIII detector at the BEPCII collider with a total integrated luminosity of 300 pb^{-1}, are analyzed. The total Born cross sections for the process e^{+}e^{-}→K^{+}K^{-}π^{0}π^{0}, as well as the Born cross sections for the subprocesses e^{+}e^{-}→ϕπ^{0}π^{0}, K^{+}(1460)K^{-}, K_{1}^{+}(1400)K^{-}, K_{1}^{+}(1270)K^{-}, and K^{+}(892)K^{-}(892), are measured versus the center-of-mass energy. The corresponding results for e^{+}e^{-}→K^{+}K^{-}π^{0}π^{0} and ϕπ^{0}π^{0} are consistent with those of BABAR with better precision. By analyzing the cross sections for the four subprocesses, K^{+}(1460)K^{-}, K_{1}^{+}(1400)K^{-}, K_{1}^{+}(1270)K^{-}, and K^{+}(892)K^{-}(892), a structure with mass M=(2126.5±16.8±12.4) MeV/c^{2} and width Γ=(106.9±32.1±28.1) MeV is observed with an overall statistical significance of 6.3σ, although with very limited significance in the subprocesses e^{+}e^{-}→K_{1}^{+}(1270)K^{-} and K^{+}(892)K^{-}(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
在质心能量范围为2.000至2.644 GeV的情况下，对过程(e^{+}e^{-}\to K^{+}K^{-}\pi^{0}\pi^{0})进行了分波分析。分析了由北京正负电子对撞机（BEPCII）上的北京谱仪III（BESIII）探测器收集的(e^{+}e^{-})碰撞数据样本，其总积分亮度为300 pb⁻¹。测量了过程(e^{+}e^{-}\to K^{+}K^{-}\pi^{0}\pi^{0})的总玻恩截面，以及子过程(e^{+}e^{-}\to\phi\pi^{0}\pi^{0})、(K^{+}(1460)K^{-})、(K_{1}^{+}(1400)K^{-})、(K_{1}^{+}(1270)K^{-})和(K^{+}(892)K^{-}(892))的玻恩截面随质心能量的变化情况。(e^{+}e^{-}\to K^{+}K^{-}\pi^{0}\pi^{0})和(\phi\pi^{0}\pi^{0})的相应结果与BABAR的结果一致，且精度更高。通过分析四个子过程(K^{+}(1460)K^{-})、(K_{1}^{+}(1400)K^{-})、(K_{1}^{+}(1270)K^{-})和(K^{+}(892)K^{-}(892))的截面，观察到一个质量(M=(2126.5\pm16.8\pm12.4)) MeV/c²、宽度(\Gamma=(106.9\pm32.1\pm28.1)) MeV的结构，其总体统计显著性为6.3σ，不过在子过程(e^{+}e^{-}\to K_{1}^{+}(1270)K^{-})和(K^{+}(892)K^{-}(892))中的显著性非常有限。所观察到的结构的共振参数表明它可以被认定为(\phi(2170))，因此这些结果为(\phi(2170))的内部性质提供了有价值的信息。
