Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-01-24
Phys.Part.Nucl. 32 (2001) 560-588; Fiz.Elem.Chast.Atom.Yadra 32 (2001) 1061-1114
Physics
High Energy Physics
High Energy Physics - Phenomenology
45 pages, 2 postscript figures, uses RevTeX style
Scientific paper
Five different versions of the three-dimensional (3D) reduction of the Bethe-Salpeter (BS) equation in the instantaneous approximation for kernel of BS equation for the two-fermion systems are formulated. The normalization condition for the bound-state wave function in all versions are derived. Further, the 3D reduction of BS equation without instantaneous approximation for the kernel of BS equation is formulated in the quasi-potential approach. Except of the Salpeter version, other four versions have the correct one-body limit (Dirac equation) when mass of one of constituent fermions tends to infinity. Application of these versions for investigation of the different properties of the q bar q bound systems are considered.
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