Centrality Dependence of Neutral Pion Production in 158 A GeV Pb + Pb Collisions

Details Centrality Dependence of Neutral Pion Production in 158 A GeV Pb + Pb Collisions Centrality Dependence of Neutral Pion Production in 158 A GeV Pb + Pb Collisions

1998-06-26

arxiv.org/abs/nucl-ex/9806004v3

Phys.Rev.Lett.81:4087-4091,1998; Erratum-ibid.84:578-579,2000

Physics

Nuclear Physics

Nuclear Experiment

5 pages, Latex, including 3 eps figures, submitted to Phys.Rev.Lett; updated pQCD comparison due to new input from the author,

Scientific paper

10.1103/PhysRevLett.81.4087

The production of neutral pions in 158AGeV Pb+Pb collisions has been studied in the WA98 experiment at the CERN SPS. Transverse momentum spectra are studied for the range 0.3 GeV/c < mT-m0 < 4.0 GeV/c. The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30 participating nucleons which is most naturally explained by assuming an equilibrated system.

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