Journal
PHYSICS OF ATOMIC NUCLEI
Volume 70, Issue 10, Pages 1764-1772Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063778807100134
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The hyperfine splittings in heavy quarkonia are studied in a model-independent way using experimental data on dielectron widths. Relativistic correlations are taken into account together with the smearing of spin-spin interaction. The radius of smearing is fixed by known J/psi-eta(c)(1S), psi(2S)-eta(')(c)(2S) splittings, which appears to be small, r(ss) congruent to 0.06 fm. Nevertheless, even with such a small radius, substantial suppression of hyperfine splittings (similar to 50%) is observed in bottomonium. For nS b (b) over bar states (n = 1, 2, ..., 6), our predicted splittings (in MeV) are 28, 12, 10, 5, 6, 3. For the 3S and 4S charmonium states, the splittings 16(2) and 12(4) MeV are obtained.
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