Common Suppression Pattern of η and π0 Mesons at High Transverse Momentum in Au+Au Collisions at sNN=200GeV
Inclusive transverse momentum spectra of η mesons have been measured within pT=2 10GeV/c at midrapidity by the PHENIX experiment in Au+Au collisions at sNN=200GeV. In central Au+Au the η yields are significantly suppressed compared to peripheral Au+Au, d+Au, and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality, and pT dependence of the suppression is common, within errors, for η and π0. The ratio of η to π0 spectra at high pT amounts to 0.40<Rη/π0<0.48 for the three systems, in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in e+e- collisions.
Physical Review Letters
- Pub Date:
- May 2006
- Particle and resonance production;
- Nuclear Experiment
- 331 authors, 6 pages text, 4 figures. Submitted to Phys. Rev. Lett. 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