  By working out the kinematics of double parton scattering at short relative
transverse distances, we obtain an explicit link between the transverse centres
of mass, of the two hard partonic interactions, and the contributions to the
process, due to pairs of interacting partons generated by perturbative
splitting. One my thus foresee the interesting possibility of discriminating
experimentally between contributions to the double parton scattering cross
section, due to interacting parton pairs originated by independent evolution,
and contributions, due to interacting parton pairs generated by splitting.
