Charmonium spectrum from the instanton vacuum

초록

In this talk, we present recent results for the charmonium spectrum, incorporating the heavy-quark potential derived from the instanton vacuum. We plug it into the Cornell-type potential that consists of the confining potential and Coulomb-like potential that arises from one-gluon exchange. In addition, we also consider the instanton effects on one-gluon exchange, which leads to the Yukawa-type potential. Combining all together, we compute the masses of charmonia. The results are in good agreement with the experimental data, fitting only four parameters. We discuss the effects from the instanton vacuum. In addition, we discuss the results for radiative decays of charmonia.