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Charged-particle multiplicity near midrapidity in central Au+Au collisions at sqrt[SNN]=56 and 130 GeV |
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| Authors: | Back B B Baker M D Barton D S Basilev S Bates B D Baum R Betts R R Białas 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 Gałuszka 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 Hołyński R Holzman B Johnson E Kane J Katzy J Kita W Kotuła J Kraner H Kucewicz W Kulinich P LawV C Lemler M Ligocki J Lin W T Manly S McLeod D Michałowski J Mignerey A Mülmenstädt J Neal M |
| Affiliation: | Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA. |
| 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. |
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