Quark-Antiquark Bound States and the Breit Equation

Details Quark-Antiquark Bound States and the Breit Equation Quark-Antiquark Bound States and the Breit Equation

2000-07-13

arxiv.org/abs/hep-ph/0007143v1

Acta Phys.Polon. B35 (2004) 2329-2366

Physics

High Energy Physics

High Energy Physics - Phenomenology

39 pages, LaTeX

Scientific paper

A non-covariant but approximately relativistic two-body wave equation (Breit equation) describing the quantum mechanics of two fermions interacting with one another through a potential containing scalar, pseudoscalar and vector parts is presented. After expressing the sixteen component two-body wavefunction in terms of a radial and an angular function by means of the multipole expansion, the initial equation can be reduced into a set of sixteen radial equations which, in turn, can be classified in accordance to the parity and the state of the wavefunctions involved. The adequacy of the reduced equations in describing real problems is discussed by applying the theory to QCD problems and the calculation of the energies of bound states of quark-antiquark systems is performed to order $\alpha^4$. We show that bound states of heavy quarks can be described adequately by the Breit equation for a funnel interaction between the particles

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