DOI 10.1007/s100529800964
Transverse momentum distributions of neutral pions
from nuclear collisions at 200 AGeV
WA80 Collaboration
R.Albrecht1 - et al.
1 Gesellschaft für Schwerionenforschung, D-64220 Darmstadt, Germany
Received: 10 March 1998 / Revised version: 22 May 1998 / Published online: 12 August 1998
Abstract
New results on transverse mass spectra of neutral
pions measured at central rapidity
are presented for impact parameter selected
200
GeV S+S and S+Au collisions. The
distributions cover more than 8 orders of magnitude in cross section
over the range 
. Detailed comparisons to results
from pp collisions are made. The spectra from
all systems show a clear power-law like shape with similar
curvature. Collisions
of S+Au exhibit a larger mean transverse momentum than pp increasing
with centrality. Predictions of string models and by
hydrodynamic approaches including collective expansion and decays
of short lived resonances are compared to the data and the
implications are discussed.
Copyright Springer-Verlag
