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Institute of High Energy Physics, Beijing 100049, People's Republic of China.
Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2023 Oct 13;131(15):151903. doi: 10.1103/PhysRevLett.131.151903.
The process e^{+}e^{-}→D_{s}^{+}D_{s}^{-} is studied with a semi-inclusive method using data samples at center-of-mass energies from threshold to 4.95 GeV collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross sections of the process are measured for the first time with high precision in this energy region. Two resonance structures are observed in the energy-dependent cross sections around 4.2 and 4.4 GeV. By fitting the cross sections with a coherent sum of three Breit-Wigner amplitudes and one phase-space amplitude, the two significant structures are assigned masses of (4186.8±8.7±30) and (4414.6±3.4±6.1) MeV/c^{2}, widths of (55±15±53) and (122.5±7.5±8.1) MeV, where the first errors are statistical and the second ones are systematic. The inclusion of a third Breit-Wigner amplitude is necessary to describe a structure around 4.79 GeV.
利用在北京正负电子对撞机上运行的BESIII探测器收集的质心能量从阈值到4.95 GeV的数据样本，采用半包含方法研究了过程(e^{+}e^{-}→D_{s}^{+}D_{s}^{-})。在该能量区域首次高精度测量了该过程的玻恩截面。在4.2和4.4 GeV附近的能量依赖截面中观察到两个共振结构。通过用三个布赖特-维格纳振幅和一个相空间振幅的相干和拟合截面，这两个显著结构的质量分别为(4186.8±8.7±30)和(4414.6±3.4±6.1) MeV/c²，宽度分别为(55±15±53)和(122.5±7.5±8.1) MeV，其中第一个误差是统计误差，第二个是系统误差。为了描述4.79 GeV附近的一个结构，必须包含第三个布赖特-维格纳振幅。
