QuarkAntiquark Bound States and the Breit Equation
Abstract
A noncovariant but approximately relativistic twobody 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 twobody 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 quarkantiquark systems is performed to order α ^{4}. We show that bound states of heavy quarks can be described adequately by the Breit equation for a funnel interaction between the particles.
 Publication:

Acta Physica Polonica B
 Pub Date:
 October 2004
 arXiv:
 arXiv:hepph/0007143
 Bibcode:
 2004AcPPB..35.2329T
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 39 pages, LaTeX