Phys. Rev. Lett.
85,
3100–3104
(2000)
Charged-Particle Multiplicity near Midrapidity in Central Au+Au Collisions at √sNN = 56 and 130GeV
B. B. Back et al. (PHOBOS Collaboration)
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B. B. Back1, M. D. Baker2, D. S. Barton2, S. Basilev5, B. D. Bates5, R. Baum9, R. R. Betts1,7, A. Białas4, R. Bindel8, W. Bogucki3, A. Budzanowski3, W. Busza5, A. Carroll2, M. Ceglia2, Y.-H. Chang6, A. E. Chen6, T. Coghen3, C. Conner7, W. Czyż4, B. Da̧browski3, M. P. Decowski5, M. Despet3, P. Fita5, J. Fitch5, M. Friedl5, K. Gałuszka3, R. Ganz7, E. Garcia8, N. George1, J. Godlewski3, C. Gomes5, E. Griesmayer5, K. Gulbrandsen5, S. Gushue2, J. Halik3, C. Halliwell7, P. Haridas5, A. Hayes10, G. A. Heintzelman2, C. Henderson5, R. Hollis7, R. Hołyński3, B. Holzman7, E. Johnson10, J. Kane5, J. Katzy5,7, W. Kita3, J. Kotuła3, H. Kraner2, W. Kucewicz7, P. Kulinich5, C. Law5, M. Lemler3, J. Ligocki3, W. T. Lin6, S. Manly10,11, D. McLeod7, J. Michałowski3, A. Mignerey8, J. Mülmenstädt5, M. Neal5, R. Nouicer7, A. Olszewski2,3, R. Pak2, I. C. Park10, M. Patel5, H. Pernegger5, M. Plesko5, C. Reed5, L. P. Remsberg2, M. Reuter7, C. Roland5, G. Roland5, D. Ross5, L. Rosenberg5, J. Ryan5, A. Sanzgiri11, P. Sarin5, P. Sawicki3, J. Scaduto2, J. Shea8, J. Sinacore2, W. Skulski10, S. G. Steadman5, G. S. F. Stephans5, P. Steinberg2, A. Stra̧czek3, M. Stodulski3, M. Strȩk3, Z. Stopa3, A. Sukhanov2, K. Surowiecka5, J.-L. Tang6, R. Teng10, A. Trzupek3, C. Vale5, G. J. van Nieuwenhuizen5, R. Verdier5, B. Wadsworth5, F. L. H. Wolfs10, B. Wosiek3, K. Woźniak3, A. H. Wuosmaa1, B. Wysłouch5, K. Zalewski4, and P. Żychowski3 (PHOBOS Collaboration)
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843
2Chemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000
3Institute of Nuclear Physics, Kraków, Poland
4Department of Physics, Jagellonian University, Kraków, Poland
5Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
6Department of Physics, National Central University, Chung-Li, Taiwan
7Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059
8Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
9Department of Physics, University of Maryland, College Park, Maryland 20742
10Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627
11Department of Physics, Yale University, New Haven, Connecticut 06520
Received 19 July 2000; published in the issue dated 9 October 2000
We present the first measurement of pseudorapidity densities of primary charged particles near midrapidity in Au+Au collisions at √sNN = 56 and 130GeV. For the most central collisions, we find the charged-particle pseudorapidity density to be dN/dη||η|<1 = 408±12(stat)±30(syst) at 56GeV and 555±12(stat)±35(syst) at 130GeV, 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.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.3100
DOI:
10.1103/PhysRevLett.85.3100
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