Possible effects of color screening and large string tension in heavy quarkonium spectra

Possible effects of the color-screened confinement potential are investigated. A color-screened linear potential with a large string tension T=(0.26–0.32) ${\mathrm{GeV}}^2$ is suggested by a study of the cc¯ and bb¯ spectra. The ψ(4160) and ψ(4415) are, respectively, assigned as the ψ(4S)-dominated and the ψ(5S) cc¯ states. Satisfactory results for the masses and leptonic widths (with QCD radiative corrections) of cc¯ and bb¯ states are obtained.