Intrinsic broadening of the transverse momentum spectra in ultrarelativistic heavy-ion collisions?

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 PT broadening and not by hadronic rescattering, i.e., transverse flow. (C) 2001 Published by Elsevier Science B.V.