  The mean transverse momentum in high energy nuclear collisions is studied.
The formation of a Color Glass Condensate results in an increase of the square
of the mean transverse momentum with the charged multiplicity per unit rapidity
and unit transverse area. This prediction is in agreement with the presently
available data, in particular with the heavy-ion data, lending support to the
notion that the transverse momentum spectra in ultrarelativistic collisions of
heavy nuclei might be controlled by intrinsic transverse momentum broadening
and not by hadronic rescattering, i.e. transverse flow.
