  In this paper, we investigate the center of mass energy of the collision for
two neutral particles with different rest masses falling freely from rest at
infinity in the background of a Kerr-Newman-Taub-NUT black hole. Further, we
discuss the center of mass energy near the horizon(s) of an extremal and
non-extremal Kerr-Newman-Taub-NUT black hole and show that an arbitrarily high
center of mass energy is achievable under some restrictions. We will study the
special case of the center of mass energy when the specific energy, specific
angular momentum and Carter constant of both the particles are same.
