Abstract
We take the recently found charmonium state at 2.976 GeV to be the η c and show that it can be included in a charmonium model with relativistic corrections which reproduces the s-wave spectrum, the leptonic widths Γ(V→e + e−) and the p-wave splittings. The upsilon spectrum is discussed as are the effects of radial and pseudoscalar mixing.
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Bradley, A., Gault, F.D. Pseudoscalars in the charmonium model. Z. Phys. C - Particles and Fields 5, 239–242 (1980). https://doi.org/10.1007/BF01421782
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DOI: https://doi.org/10.1007/BF01421782