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arXiv 2403.01017hep-ex
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通过全局拟合测定 chi_c0(3915) 的共振参数

Determination of the resonant parameters of chi_c0(3915) with global fit

Chunhua Li, Xijun Wang, Chen Wu

AI总结:

本研究通过联合拟合 Belle、Babar 和 LHCb 关于 omega J/psi 不变质量谱的测量,提取 chi_c0(3915) 的质量与宽度,获得与 PDG 一致且更精确的共振参数。

摘要:

chi_c0(3915) 最初由 Belle 实验在过程 B -> K omega J/psi 的 omega J/psi 不变质量谱中观测到,随后由 Babar 实验证实。这两个实验通过将 chi_c0(3915) 假设为 S 波 Breit-Wigner 共振,报告了该粒子在 gammagamma -> omega J/psi 和 B -> K omega J/psi 两个过程中的共振参数。我们对 Belle 和 Babar 实验测量的 omega J/psi 不变质量分布进行全局拟合,并额外纳入 LHCb 实验的测量结果,以提取 chi_c0(3915) 的质量和宽度。我们得到 M = 3921.0 ± 0.9 MeV/c2 和 Gamma = 17.9 ± 2.4 MeV,这些结果与 PDG 上的数值在一个标准差内一致,但精度有所提高。

英文摘要:

The chi_c0(3915) was observed firstly by the Belle experiment in the omega J/psi invariant mass spectrum in the process B -> K omegaJ/psi, and then confirmed by the Babar experiment. The two experiments reported the resonant parameters of this particle in the both processes gammagamma -> omegaJ/psi and B -> K omega J/psi by assuming chi_c0(3915) as a S-wave Breit-Wigner resonance. We perform a global fit to the distributions of invariant mass of omega J/psi measured by the Belle and Babar experiments, and incorporate the measurement by the LHCb experiment additionally to extract the mass and width of chi_c0(3915). We obtain M = 3921.0 +/- 0.9 MeV/c2 and Gamma = 17.9 +/- 2.4 MeV which are consistent with the values on PDG within one standard deviation but with improved precision.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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