State of Charmonium
نویسندگان
چکیده
A theoretical explanation of the observed splittings among the P states of charmonium is given with the use of a nonsingular potential model for heavy quarkonia. We also show that the recently observed mass difference between the center of gravity of the PJ states and the P1 state of cc̄ does not provide a direct test of the color hyperfine interaction in heavy quarkonia. Our theoretical value for the mass of the P1 state is in agreement with the experimental result, and its E1 transition width is 341.8 keV. The mass of the η c state is predicted to be 3622.3 MeV. 14.40.Gx,12.39.Pn,13.20.Gd,13.40.Hq Typeset using REVTEX 1
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