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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2004 Apr 9;92(14):142002. doi: 10.1103/PhysRevLett.92.142002. Epub 2004 Apr 5.
The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c)-->K(0)(S)K+/-pi(-/+) decays in 88 fb(-1) of data, the results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) and Gamma(eta(c))(tot)=34.3+/-2.3(stat)+/-0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112+/-24 events is observed with a mass of 3630.8+/-3.4(stat)+/-1.0(syst) MeV/c(2) and width of 17.0+/-8.3(stat)+/-2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.
利用SLAC正负电子非对称B工厂的BABAR探测器，通过双光子相互作用测量了ηc介子的质量m(ηc)和总宽度Γ(ηc)(tot)。在88 fb⁻¹的数据中，有大约2500个重建的ηc→K⁰(S)K⁺⁻π⁻⁺衰变样本，结果为m(ηc)=2982.5±1.1(统计)±0.9(系统)MeV/c²，Γ(ηc)(tot)=34.3±2.3(统计)±0.9(系统)MeV/c²。使用相同的衰变模式，观察到一个具有112±24个事例的第二共振态，其质量为3630.8±3.4(统计)±1.0(系统)MeV/c²，宽度为17.0±8.3(统计)±2.5(系统)MeV/c²。这一观察结果与ηc(2S)态的预期相符。
