Transverse momentum spectra of neutral pions in the range 1<pT<10 GeV/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au+Au collisions at (sNN)=200 GeV. The π0 multiplicity in central reactions is significantly below the yields measured at the same (sNN) in peripheral Au+Au and p+p reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the suppression factor is ̃2.5 at pT=2 GeV/c and increases to ̃4 5 at pT≈4 GeV/c. At larger pT, the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.
Physical Review Letters
- Pub Date:
- August 2003
- Particle and resonance production;
- Nuclear Experiment;
- High Energy Physics - Experiment
- 326 authors, 6 pages text, RevTeX, 3 figures, 2 tables. Submitted to PRL. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html