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From Regge trajectories to a static sine-Gordon-type equation.

We present a model of mesons and baryons as colorless bound states of effective colored quarks. Their dynamics is in both cases that of a single string, and as a result light mesons and baryons are shown to lie on parallel Regge trajectories. A baryon appears as a soliton on the string (with a favored quark-diquark structure), the underlying equation of which reduces, in a suitable approximation, to a static sine-Gordon-type equation. A baryonic number differentiating between baryons and mesons is defined.