Summary
New second-order radial equations are derived from the two-body Dirac equation (called also the Breit equation). They are convenient for numerical calculations and may be also useful for a general discussion of the order of energy levels in quarkonia.
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References
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Królikowski, W. Useful radial equations for the dirac two-body problem. Nuov Cim A 105, 655–662 (1992). https://doi.org/10.1007/BF02730771
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DOI: https://doi.org/10.1007/BF02730771