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Charged-particle multiplicity near midrapidity in central Au+Au collisions at sqrt[SNN]=56 and 130 GeV.

Back, B B; Baker, M D; Barton, D S; Basilev, S; Bates, B D; Baum, R; Betts, R R; Bialas, A; Bindel, R; Bogucki, W; Budzanowski, A; Busza, W; Carroll, A; Ceglia, M; Chang, Y H; Chen, A E; Coghen, T; Conner, C; Czyz, W; Dabrowski, B; Decowski, M P; Despet, M; Fita, P; Fitch, J; Friedl, M; Galuszka, K; Ganz, R; Garcia, E; George, N; Godlewski, J; Gomes, C; Griesmayer, E; Gulbrandsen, K; Gushue, S; Halik, J; Halliwell, C; Haridas, P; Hayes, A; Heintzelman, G A; Henderson, C; Hollis, R; Holynski, R; Holzman, B; Johnson, E; Kane, J; Katzy, J; Kita, W; Kotula, J; Kraner, H; Kucewicz, W.

Phys Rev Lett ; 85(15): 3100-4, 2000 Oct 09.

Article in English | MEDLINE | ID: mdl-11019276

ABSTRACT

We present the first measurement of pseudorapidity densities of primary charged particles near midrapidity in Au+Au collisions at sqrt[s(NN)] = 56 and 130 GeV. For the most central collisions, we find the charged-particle pseudorapidity density to be dN/deta|(|eta|<1) = 408+/-12(stat)+/-30(syst) at 56 GeV and 555+/-12(stat)+/-35(syst) at 130 GeV, 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.

ABSTRACT

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