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doi: 10.1007/bf01421782
We take the recently found charmonium state at 2.976 GeV to be the ηc 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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