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  • Observation of a Vector Charmoniumlike State at 4.7  GeV/c^{2} and Search for Z_{cs} in e^{+}e^{-}→K^{+}K^{-}J/ψ
    Aliberti, R; Chelkov, G; Chen, C; Chen, H S; Choi, S K; Dedovich, D; Deng, C Q; Denysenko, I; Dong, L Y; Fang, Y Q; Gersabeck, E M; Gong, L; Gradl, W; Guan, C Y; Gutierrez, J; Holtmann, T; Ji, X B; Jiang, X S; Jiao, J K; Ke, B C; Lei, T T; Lei, Z H; Leithoff, H; Lellmann, M; Li, C; Li, C H; Li, Hui; Li, J R; Li, Q X; Li, X L; Liang, C; Liang, Y F; Liu, H B; Liu, J B; Liu, L C; Liu, Y; Lou, X C; Lu, H J; Lu, Y P; Lu, Z H; Ma, H; Ma, X Y; Malde, S; Miao, H; Nisar, S; Niu, Q L; Niu, Y; Olsen, S L; Pan, X; Ping, J L; Plura, S; Qi, F Z; Qi, M; Qi, T Y; Qin, X S; Scodeggio, M; Shan, K Y; Shan, X Y; Shen, C P; Shi, X; Su, Y J; Sun, J F; Sun, W Y; Sun, Y; Sun, Y J; Sun, Y Z; Tang, C J; Tang, G Y; Tao, L Y; Tat, M; Tian, Y; Tian, Z F; Wen, S P; Wu, J F; Wu, L H; Xian, X M; Xiang, B H; Xiao, S Y; Xu, C J; Yang, H J; Yang, H X; Zeng, X; Zhang, H Y; Zhang, J; Zhang, L M; Zhang, Lei; Zhang, Shuihan; Zhang, X M; Zhang, X Y; Zhao, G; Zhao, Lei; Zhao, S J; Zhemchugov, A; Zhou, X; Zhou, X K; Zhou, Y Z; Zhu, J; Zhu, K; Zhu, S H; Zou, J H

    Physical review letters, 2023-Nov-24, 20231124, Letnik: 131, Številka: 21
    Journal Article

    Using data samples with an integrated luminosity of 5.85  fb^{-1} collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process e^{+}e^{-}→K^{+}K^{-}J/ψ. A new resonance with a mass of M=4708_{-15}^{+17}±21  MeV/c^{2} and a width of Γ=126_{-23}^{+27}±30  MeV is observed in the energy-dependent line shape of the e^{+}e^{-}→K^{+}K^{-}J/ψ cross section with a significance over 5σ. The K^{+}J/ψ system is also investigated to search for charged charmoniumlike states, but no significant Z_{cs}^{+} states are observed. Upper limits on the Born cross sections for e^{+}e^{-}→K^{-}Z_{cs}(3985)^{+}/K^{-}Z_{cs}(4000)^{+}+c.c. with Z_{cs}(3985)^{±}/Z_{cs}(4000)^{±}→K^{±}J/ψ are reported at 90% confidence levels. The ratio of branching fractions {B(Z_{cs}(3985)^{+}→K^{+}J/ψ)/BZ_{cs}(3985)^{+}→(Dover ¯^{0}D_{s}^{*+}+Dover ¯^{*0}D_{s}^{+})} is measured to be less than 0.03 at 90% confidence level.

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