Spin effects in heavy quarkonia
L. Motyka, K. Zalewski
Abstract
A model based on a nonrelativistic potential supplemented by spin dependent terms of the Breit-Fermi type is described. This model reproduces the known masses of the bb quarkonia within 1MeV and the known masses of the cc quarkonia within 5MeV. Many predictions are made, some of them, e.g. for the fine splittings of the high L states of the bb quarkonia and of the mass spectrum of the bc quarkonia, significantly different from previous predictions made by other authors.
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