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Non-perturbative effects in heavy quarkonia
1981
Physics Letters B
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The effect of a non-zero vacuum gluon-condensate on heavy LBL-11551 quarkonia is discussed. As a function of the quark mass, it is determined which low lying levels of the spectrum are dominated by the one-gluon-exchange potential. -2-A useful feature of the observed heavy quarkonium states is that the energy gap between the ground state and the manifest flavor threshold is much smaller than the resonance mass itself. This implies
doi:10.1016/0370-2693(81)90499-8
fatcat:cygjbehpsbhrbfmxdegl3twie4