Phys. Rev. Lett.
82,
2471–2475
(1999)
Baryon Stopping and Charged Particle Distributions in Central Pb+Pb Collisions at 158 GeV per Nucleon
H. Appelshäuser et al. (NA49 Collaboration)
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H. Appelshäuser7,*, J. Bächler5, S. J. Bailey16, L. S. Barnby3, J. Bartke6, R. A. Barton3, H. Białkowska14, A. Billmeier10, C. O. Blyth3, R. Bock7, B. Boimska14, C. Bormann10, F. P. Brady8, R. Brockmann7,†, R. Brun5, P. Bunc̆ić5,10, H. L. Caines3, D. Cebra8, G. E. Cooper2, J. G. Cramer16, P. Csato4, J. Dunn8, V. Eckardt13, F. Eckhardt12, M. I. Ferguson5, H. G. Fischer5, D. Flierl10, Z. Fodor4, P. Foka10, P. Freund13, V. Friese12, M. Fuchs10, F. Gabler10, J. Gal4, R. Ganz13, M. Gaździcki10, W. Geist13, E. Gładysz6, J. Grebieszkow15, J. Günther10, J. W. Harris17, S. Hegyi4, T. Henkel12, L. A. Hill3, I. Huang2,8, H. Hümmler10,‡, G. Igo11, D. Irmscher2,7, P. Jacobs2, P. G. Jones3, K. Kadija18,13, V. I. Kolesnikov9, M. Kowalski6, B. Lasiuk11,17, P. Lévai4, A. I. Malakhov9, S. Margetis2,§, C. Markert7, G. L. Melkumov9, A. Mock13, J. Molnár4, J. M. Nelson3, M. Oldenburg10, G. Odyniec2, G. Palla4, A. D. Panagiotou1, A. Petridis1, A. Piper12, R. J. Porter2, A. M. Poskanzer2, S. Poziombka10, D. J. Prindle16, F. Pühlhofer12, J. G. Reid16, R. Renfordt10, W. Retyk15, H. G. Ritter2, D. Röhrich10, C. Roland7, G. Roland10, H. Rudolph2,10, A. Rybicki6, A. Sandoval7, H. Sann7, A. Yu. Semenov9, E. Schäfer13, D. Schmischke10, N. Schmitz13, S. Schönfelder13, P. Seyboth13, F. Sikler4, E. Skrzypczak15, G. T. A. Squier3, R. Stock10, H. Ströbele10, I. Szentpetery4, J. Sziklai4, M. Toy2,11, T. A. Trainor16, S. Trentalange11, T. Ullrich17, M. Vassiliou1, G. Vesztergombi4, D. Vranić5,18, F. Wang2, D. D. Weerasundara16, S. Wenig5, C. Whitten11, T. Wienold2,**, L. Wood8, N. Xu2, T. A. Yates3, J. Zimanyi4, X.-Z. Zhu16, and R. Zybert3 (NA49 Collaboration)
1Department of Physics, University of Athens, Athens, Greece
2Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
3Birmingham University, Birmingham, United Kingdom
4KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
5CERN, Geneva, Switzerland
6Institute of Nuclear Physics, Cracow, Poland
7Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany
8University of California at Davis, Davis, California 95616
9Joint Institute for Nuclear Research, Dubna, Russia
10Fachbereich Physik der Universität, Frankfurt, Germany
11University of California at Los Angeles, Los Angeles, California 90095
12Fachbereich Physik der Universität, Marburg, Germany
13Max-Planck-Institut für Physik, Munich, Germany
14Institute for Nuclear Studies, Warsaw, Poland
15Institute for Experimental Physics, University of Warsaw, Warsaw, Poland
16Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195
17Yale University, New Haven, Connecticut 06520
18Rudjer Boskovic Institute, Zagreb, Croatia
Received 22 October 1998; published in the issue dated 22 March 1999
Net proton and negative hadron spectra for central Pb+Pb collisions at 158 GeV per nucleon at the CERN Super Proton Synchrotron were measured and compared to spectra from lighter systems. Net baryon distributions were derived from those of net protons. Stopping (rapidity shift with respect to the beam) and mean transverse momentum 〈pT〉 of net baryons increase with system size. The rapidity density of negative hadrons scales with the number of participant nucleons for nuclear collisions, whereas their 〈pT〉 is independent of system size. The 〈pT〉 dependence upon particle mass and system size is consistent with larger transverse flow velocity at midrapidity for Pb+Pb compared to S+S central collisions.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.2471
DOI:
10.1103/PhysRevLett.82.2471
*Present address: Physikalisches Institut, Universitaet Heidelberg, Heidelberg, Germany. †Deceased. ‡Present address: Max-Planck-Institut für Physik, Munich, Germany. §Present address: Kent State University, Kent, OH 44242. **
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