More nonperturbative corrections to the fine and hyperfine splitting in heavy quarkonium
- Departament dEstructura i Constituents de la Materia and Institut de Fisica dAltes Energies, Universitat de Barcelona, Diagonal, 647, E-08028 Barcelona, Catalonia (Spain)
Leading nonperturbative effects to fine and hyperfine splittings were calculated some time ago. Recently, they have been used in order to obtain realistic numerical results for the lower levels in bottomonium systems. We point out that a contribution of the same order O({Lambda}{sub QCD}{sup 4}/m{sup 3}{alpha}{sub s}{sup 2}) has been overlooked. We calculate it in this paper. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 439123
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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