Charged particle multiplicity near mid-rapidity in central Au+Au collisions at $\sqrt{s} = $ 56 and 130 AGeV

Details Charged particle multiplicity near mid-rapidity in central Au+Au collisions at $\sqrt{s} = $ 56 and 130 AGeV Charged particle multiplicity near mid-rapidity in central Au+Au collisions at $\sqrt{s} = $ 56 and 130 AGeV

2000-07-19

arxiv.org/abs/hep-ex/0007036v2

Phys.Rev.Lett.85:3100-3104,2000

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures, revtex (submitted to Phys. Rev. Letters), revised Fig. 4

Scientific paper

10.1103/PhysRevLett.85.3100

We present the first measurement of pseudorapidity densities of primary charged particles near mid-rapidity in Au+Au collisions at $\sqrt{s} =$ 56 and 130 AGeV. For the most central collisions, we find the charged particle pseudorapidity density to be $dN/d\eta |_{|\eta|<1} = 408 \pm 12 {(stat)} \pm 30 {(syst)}$ at 56 AGeV and $555 \pm 12 {(stat)} \pm 35 {(syst)}$ at 130 AGeV, values that are higher than any previously observed in nuclear collisions. Compared to proton-antiproton collisions, our data show an increase in the pseudorapidity density per participant by more than 40% at the higher energy.

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