Abstract
The problems of both El and M1 transitions of charmonium are discussed in the nonrelativistic potential model. It is found that these problems could be resolved by assuming larger constituent quark masses. With , in the typical linear plus Coulomb potential model we get satisfactory results for the mass spectra, the El and M1 transition rates, and the relative values of leptonic widths for the and families. The implication of the large constituent quark masses is also discussed.
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