Acta Physica Polonica B
Vol. 36, No. 2, February 2005, page 565
Indications for the Onset of Deconfinement in Pb + Pb Collisions at the CERN SPS from NA49
P. Seyboth, C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Bialkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, R. Brun, P. Buncic, V. Cerny, P. Christakoglou, O. Chvala, J.G. Cramer, P. Csato, N. Darmenov, A. Dimitrov, P. Dinkelaker, V. Eckardt, G. Farantatos, D. Flierl, Z. Fodor, P. Foka, P. Freund, V. Friese, J. Gal, M. Gazdzicki, G. Georgopoulos, E. Gladysz, K. Grebieszkow, S. Hegyi, C. Hoehne, K. Kadija, A. Karev, M. Kliemant, S. Kniege, V.I. Kolesnikov, T. Kollegger, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, M. van Leeuwen, P. Levai, L. Litov, B. Lungwitz, M. Makariev, A.I. Malakhov, C. Markert, M. Mateev, B.W. Mayes, G.L. Melkumov, C. Meurer, A. Mischke, M. Mitrovski, J. Molnar, St. Mrowczynski, G. Palla, A.D. Panagiotou, D. Panayotov, A. Petridis, M. Pikna, L. Pinsky, F. Puehlhofer, R. Renfordt, A. Richard, C. Roland, G. Roland, M. Rybczynski, A. Rybicki, A. Sandoval, H. Sann, N. Schmitz, P. Seyboth, F. Sikler, B. Sitar, E. Skrzypczak, G. Stefanek, R. Stock, H. Stroebele, T. Susa, I. Szentpetery, J. Sziklai, T.A. Trainor, D. Varga, M. Vassiliou, G.I. Veres, G. Vesztergombi, D. Vranic, A. Wetzler, Z. Wlodarczyk, I.K. Yoo, J. Zaranek, J. Zimanyi
Particle production in central Pb+Pb collisions was studied with
the NA49 large acceptance spectrometer at the CERN SPS at beam energies
of 20, 30, 40, 80, and 158 GeV per nucleon. A change of the energy
dependence is observed around 30A GeV for the yields of pions and
strange particles as well as for the shapes of the transverse mass
spectra. At present only a reaction scenario with onset of
deconfinement is able to reproduce the measurements.
PACS numbers: 25.75.--q, 12.38.Mh, 12.40.Ee
Full paper: v36p0565.pdf (PDF 269 KB)