Transverse mass distributions of neutral pions from 208Pb-induced reactions at 158 · A GeV
Revised: 19 November 2001
Published online: 8 February 2002
Results on transverse mass spectra of neutral pions measured at central rapidity are presented for impact parameter selected 158 · A GeV Pb + Pb, and Pb + Nb collisions. The distributions cover the range 0.5 GeV/c2 ≤ mT - m0 ≤ 4 GeV/c2. The change of the spectral shape and the multiplicity with centrality is studied in detail. In going from p+p to semi-peripheral Pb+Pb collisions there is a nuclear enhancement increasing with transverse mass similar to the well known Cronin effect, while for very central collisions this enhancement appears to be weaker than expected.
© Società Italiana di Fisica, Springer-Verlag, 2002