0 v 1 2 8 N ov 1 99 7 Aspects of onfinement in a heavy quark - light quark system ( Q , q̄ ) in high orbital angular momentum states

The Regge behaviour of the solutions of a Dirac hamiltonian describing a heavy quark-light quark system in high orbital angular momentum states is analyzed. It is found that the solutions of a scalar confining potential are physically admissible while those of a vector confining potential are not. It is argued that with a Dirac hamiltonian a scalar confining potential is preferred over a vector confining potential for any value of the orbital angular momentum. PACS number(s) : 12.39.-x; 12.39.Pn; 12.39.-t ∗Electronic address: [email protected]