Abstract

We formulate the description of the dynamic confinement of a single fermion by a flux tube. The range of applicability of this model extends from the relativistic corrections of a slowly moving quark to the ultrarelativistic motion in a heavy-light meson. The reduced Salpeter equation, also known as the no-pair equation, provides the framework for our discussion. The Regge structure is that of a Nambu string with one end fixed. Numerical solutions are found giving very good fits to heavy-light meson masses. An Isgur-Wise function with a zero recoil slope of ${\ensuremath{\xi}}^{\ensuremath{'}}$(1)\ensuremath{\simeq}-1.26 is obtained. \textcopyright{} 1996 The American Physical Society.

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