Charged particle multiplicity and transverse energy in Au - Au collisions at $\sqrt{s_{{}_{NN}}}=130$ GeV

Abstract

This paper presents the results for the charged-particle multiplicity and transverse energy distributions at mid-rapidity in Au - Au collisions at $\sqrt{s_{{}_{NN}}}=130$ GeV measured with the PHENIX detector at RHIC. The values of $d{N}_{ch}/d{\eta }_{|\eta =0}$ and $d{E}_T/d{\eta }_{|\eta =0}$, analyzed as a function of centrality, show a consistent steady rise. For the 5% most central collisions they are $\sim 70$% larger compared to the SPS results for Pb-Pb collisions at $\sqrt{s_{{}_{NN}}}=17.2$ GeV. The ratio of $<E_T>/<N_{ch}>$ remains constant as a function of centrality at 0.8 GeV, as also observed at the SPS at CERN and at the AGS at BNL.

arXiv comment6 pages, Contribution to the proceedings of Quark Matter 2001

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