Charged-Particle Multiplicity near Midrapidity in Central Au+Au Collisions at

Journal Article · Mon Oct 09 04:00:00 EDT 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.85.3100· OSTI ID:40205863

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 ^[1]

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1. and others

We present the first measurement of pseudorapidity densities of primary charged particles near midrapidity in Au+Au collisions at s{sub NN}=56 and 130 GeV . For the most central collisions, we find the charged-particle pseudorapidity density to be dN/d{eta}|{sub |{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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Sponsoring Organization: (US)
• OSTI ID: 40205863
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 85; ISSN 0031-9007
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGED PARTICLES
COLLISIONS
MULTIPLICITY