Energy dependence of particle multiplicities in central Au+Au collisions
Abstract
We present the first measurement of the pseudorapidity density of primary charged particles in Au+Au collisions at sqrt(sNN) = 200GeV. For the 6% most central collisions, we obtain dNch/deta||eta|<1 = 650 +/- 35 (syst). Compared to collisions at sqrt(sNN) = 130GeV, the highest energy studied previously, an increase by a factor of 1.14 +/- 0.05 is found. The energy dependence of the pseudorapidity density is discussed in comparison with data from proton-induced collisions and theoretical predictions.
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