Summary
We obtain a quark-antiquark BS kernel which in the instantaneous approximation reproduces a theoretical based potential including all first-order relativistic corrections and derived in a preceding paper by an improvement of the Wilson loop method.
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References
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Brambilla, N. On the form of the quark-antiquark bethe-salpeter kernel. Nuov Cim A 105, 949–958 (1992). https://doi.org/10.1007/BF02730836
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DOI: https://doi.org/10.1007/BF02730836