Hyperfine structure in the relativistic fermion-antifermion system

1 June 1977

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 15 (11) , 3366-3376
https://doi.org/10.1103/physrevd.15.3366

Abstract

Numerical solutions of the Bethe-Salpeter equation for quark-antiquark bound states in a Coulomb potential are obtained in the instantaneous approximation. Particular emphasis is given to the mass splittings generated by the nonperturbative calculation of relativistic corrections to the simple nonrelativistic spectrum. It is shown that the hyperfine ground-state splitting of orthocharmonium and paracharmonium may be quite large.

Keywords

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