Single identified hadron spectra fromsNN=130GeVAu+Aucollisions

Abstract

Transverse momentum spectra and yields of hadrons are measured by the PHENIX collaboration in Au+Au collisions at sNN=130GeV at the Relativistic Heavy Ion Collider. The time-of-flight resolution allows identification of pions to transverse momenta of 2GeV∕c and protons and antiprotons to 4GeV∕c. The yield of pions rises approximately linearly with the number of nucleons participating in the collision, while the number of kaons, protons, and antiprotons increases more rapidly. The shape of the momentum distribution changes between peripheral and central collisions. Simultaneous analysis of all the pT spectra indicates radial collective expansion, consistent with predictions of hydrodynamic models. Hydrodynamic analysis of the spectra shows that the expansion velocity increases with collision centrality and collision energy. This expansion boosts the particle momenta, causing the yield from soft processes to exceed that for hard to large transverse momentum, perhaps as large as 3GeV∕c.21 MoreReceived 9 July 2003DOI:https://doi.org/10.1103/PhysRevC.69.024904©2004 American Physical Society