Heavy quark-meson mass gap from spectroscopy

Abstract

Using a quite accurate flavour-independence of $nS$-level mass differences in heavy quarkonia and a corresponding quasiclassical expression for the heavy quark binding energy, one shows that experimental data on masses of mesons with heavy quarks allow one to make the estimate $\bar{\Lambda }=0.63\pm 0.03$ GeV.

Comments: 7 pages, LATEX file