/ Experiment-Nucl arXiv:1009.1747

Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN SPS

Anticic, T. (Boskovic Inst., Zagreb) ; Baatar, B. (Dubna, JINR) ; Barna, D. (Budapest, RMKI) ; Bartke, J. (Cracow, INP) ; Beck, H. (Hamburg U., Dept. Math.) ; Betev, L. (CERN) ; Bialkowska, H. (Warsaw, Inst. Nucl. Studies) ; Blume, C. (Hamburg U., Dept. Math.) ; Bogusz, M. (Warsaw U. of Tech.) ; Boimska, B. (Warsaw, Inst. Nucl. Studies) ; Book, J. (Hamburg U., Dept. Math.) ; Botje, M. (NIKHEF, Amsterdam) ; Buncic, P. (CERN) ; Cetner, T. (Warsaw U. of Tech.) ; Christakoglou, P. (NIKHEF, Amsterdam) ; Chung, P. (SUNY, Stony Brook) ; Chvala, O. (Charles U.) ; Cramer, J.G. (Washington U., Seattle) ; Eckardt, V. (Munich, Max Planck Inst.) ; Fodor, Z. (Budapest, RMKI) ; Foka, P.A.U.T.HOR.= Friese, V. (Darmstadt, GSI) ; Gazdzicki, M. (Jan Kochanowski U.) ; Grebieszkow, K. (Warsaw U. of Tech.) ; Hohne, C. (Darmstadt, GSI) ; Kadija, K. (Boskovic Inst., Zagreb) ; Karev, A. (CERN) ; Kolesnikov, V.I. (Dubna, JINR) ; Kowalski, M. (Cracow, INP) ; Kresan, D. (Darmstadt, GSI) ; Laszlo, A. (Budapest, RMKI) ; Lacey, R. (SUNY, Stony Brook) ; van Leeuwen, M. (NIKHEF, Amsterdam) ; Mackowiak, M. (Warsaw U. of Tech.) ; Makariev, M. (Sofiya, Inst. Nucl. Res.) ; Malakhov, A.I. (Dubna, JINR) ; Mateev, M. (Sofiya U.) ; Melkumov, G.L. (Dubna, JINR) ; Mitrovski, M. (Hamburg U., Dept. Math.) ; Mrowczynski, S. (Jan Kochanowski U.) ; Nicolic, V. (Boskovic Inst., Zagreb) ; Palla, G. (Budapest, RMKI) ; Panagiotou, A.D. (Athens U.) ; Peryt, W.A.U.T.HOR.= Pluta, J. (Warsaw U. of Tech.) ; Prindle, D. (Washington U., Seattle) ; Puhlhofer, F. (Hamburg U., Dept. Math.) ; Renfordt, R. (Hamburg U., Dept. Math.) ; Roland, C.A.U.T.HOR.= Roland, G. (MIT) ; Rybczynski, M. (Jan Kochanowski U.) ; Rybicki, A. (Cracow, INP) ; Sandoval, A. (Darmstadt, GSI) ; Schmitz, N. (Munich, Max Planck Inst.) ; Schuster, T. (Hamburg U., Dept. Math.) ; Seyboth, P. (Munich, Max Planck Inst.) ; Sikler, F. (Budapest, RMKI) ; Skrzypczak, E. (Warsaw U.) ; Slodkowski, M. (Warsaw U. of Tech.) ; Stefanek, G. (Jan Kochanowski U.) ; Stock, R.A.U.T.HOR.= Strobele, H. (Hamburg U., Dept. Math.) ; Susa, T. (Boskovic Inst., Zagreb) ; Szuba, M. (Warsaw U. of Tech.) ; Utvic, M. (Hamburg U., Dept. Math.) ; Varga, D. (CERN) ; Vassiliou, M. (Athens U.) ; Veres, G.I. (MIT) ; Vesztergombi, G. (Budapest, RMKI) ; Vranic, D. (Darmstadt, GSI) ; Wlodarczyk, Z.A.U.T.HOR.= Wojtaszek-Szwarc, A. (Jan Kochanowski U.)

Published in: Phys.Rev.
Year: 2011
Vol.: C83
Page No: 014901
Pages: 25

Abstract: The yields of (anti-)protons were measured by the NA49 Collaboration in centrality selected Pb+Pb collisions at 40A GeV and 158A GeV. Particle identification was obtained in the laboratory momentum range from 5 to 63 GeV/c by the measurement of the energy loss dE/dx in the TPC detector gas. The corresponding rapidity coverage extends 1.6 units from mid-rapidity into the forward hemisphere. Transverse mass spectra, the rapidity dependences of the average transverse mass, and rapidity density distributions were studied as a function of collision centrality. The values of the average transverse mass as well as the midrapidity yields of protons when normalized to the number of wounded nucleons show only modest centrality dependences. In contrast, the shape of the rapidity distribution changes significantly with collision centrality, especially at 40A GeV. The experimental results are compared to calculations of the HSD and UrQMD transport models.

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