N. Linden et al., PARTICLE MOTION IN A YANG-MILLS FIELD - WONGS EQUATIONS AND SPIN-1 2 ANALOGS/, Czechoslovak journal of Physics, 46(2-3), 1996, pp. 209-215
A complete, straightforward and natural Lagrangian description is give
n for the classical non-relativistic dynamics of a particle with colou
r or internal symmetry degrees of freedom moving in a background Yang-
Mills field. This provides a new simple Lagrangian formalism for Wong'
s equations for spinless particles, and presents also their generalisa
tion, in gauge covariant form for spin-1/2 particles, within a complet
e Lagrangian formalism.