  In the present letter, the dynamics of a spin one-half particle with non
abelian charge, interacting with a non abelian monopole like configuration, is
studied. In the non spinning case, these equations correspond to the Wong ones
[1], and the associated dynamics has been extensively studied in [2]-[3]. The
classical limit of a spinning particle in an abelian was studied in [4], where
an interpretation of the celebrated Callan-Rubakov effect [5]-[6] was obtained
in purely classical terms. The present work studies an interpolating situation,
in which spin and non abelian charges are turned on. The corresponding
equations are obtaining by taking into account some earlier works about
spinning particles [7]-[9]. The conservation laws are studied in this context,
and it is found that energy and some generalization of angular momentum are
conserved just in particular limits. This is a reflection that the non abelian
interaction contains gauge field quartic interaction, which spoils the
symmetries leading to these conservation laws. The precession of the particle
is analyzed and compared with its abelian counterpart in this limit.
