/ Experiment-HEP arXiv:0912.4198

Search for the QCD critical point in nuclear collisions at the CERN SPS

Anticic, T. (Boskovic Inst., Zagreb) ; Baatar, B. (Dubna, JINR) ; Barna, D. (Budapest, RMKI) ; Bartke, J. (Cracow, INP) ; Betev, L. (CERN) ; Bialkowska, H. (Warsaw, Inst. Nucl. Studies) ; Blume, C. (Frankfurt U.) ; Boimska, B. (Warsaw, Inst. Nucl. Studies) ; Botje, M. (NIKHEF, Amsterdam) ; Bracinik, J. (Comenius U.) ; Buncic, P. (CERN) ; Cerny, V. (Comenius U.) ; Christakoglou, P. (Athens U.) ; Chung, P. (SUNY, Stony Brook, Chem. Dept.) ; Chvala, O. (Charles U.) ; Cramer, J.G. (CENPA, Seattle) ; Dinkelaker, P. (Frankfurt U.) ; Eckardt, V. (Munich, Max Planck Inst.) ; Fodor, Z. (Budapest, RMKI) ; Foka, P. (Darmstadt, GSI) ; Friese, V. (Darmstadt, GSI) ; Gazdzicki, M. (Jan Kochanowski U.) ; Genchev, V. (Sofiya, Inst. Nucl. Res.) ; Grebieszkow, K. (Warsaw U. of Tech.) ; Hohne, C. (Darmstadt, GSI) ; Kadija, K. (Boskovic Inst., Zagreb) ; Karev, A. (Munich, Max Planck Inst.) ; Kolesnikov, V.I. (Dubna, JINR) ; Kowalski, M. (Cracow, INP) ; Kreps, M. (Comenius U.) ; Laszlo, A. (Budapest, RMKI) ; Lacey, R. (SUNY, Stony Brook, Chem. Dept.) ; van Leeuwen, M. (NIKHEF, Amsterdam) ; Lungwitz, B. (Frankfurt U.) ; Makariev, M. (Sofiya U.) ; Malakhov, A.I. (Dubna, JINR) ; Mateev, M. (Sofiya U.) ; Melkumov, G.L. (Dubna, JINR) ; Mitrovski, M. (Frankfurt U.) ; Mrowczynski, St. (Jan Kochanowski U.) ; Nicolic, V. (Boskovic Inst., Zagreb) ; Palla, G. (Budapest, RMKI) ; Panagiotou, A.D. (Athens U.) ; Petridis, A. (Athens U.) ; Peryt, W. (Warsaw U. of Tech.) ; Pikna, M. (Comenius U.) ; Pluta, J. (Warsaw U. of Tech.) ; Prindle, D. (CENPA, Seattle) ; Puhlhofer, F. (Marburg U., ITP) ; Renfordt, R. (Frankfurt U.) ; Roland, C. (MIT) ; Roland, G. (MIT) ; Rybczynski, M. (Jan Kochanowski U.) ; Rybicki, A. (Cracow, INP) ; Sandoval, A. (Darmstadt, GSI) ; Schmitz, N. (Munich, Max Planck Inst.) ; Schuster, T. (Frankfurt U.) ; Seyboth, P. (Munich, Max Planck Inst.) ; Sikler, F. (Budapest, RMKI) ; Sitar, B. (Comenius U.) ; Skrzypczak, E. (Warsaw U.) ; Slodkowski, M. (Warsaw U. of Tech.) ; Stefanek, G. (Jan Kochanowski U.) ; Stock, R. (Frankfurt U.) ; Strobele, H. (Frankfurt U.) ; Susa, T. (Boskovic Inst., Zagreb) ; Szuba, M. (Warsaw U. of Tech.) ; Varga, D. (Budapest, RMKI) ; Vassiliou, M. (Athens U.) ; Veres, G.I. (Budapest, RMKI) ; Vesztergombi, G. (Budapest, RMKI) ; Vranic, D. (Darmstadt, GSI) ; Wlodarczyk, Z. (Jan Kochanowski U.) ; Antoniou, N.G. (Athens U.) ; Diakonos, F.K. (Athens U.) ; Mavromanolakis, G. (Cambridge U.)

Published in: Phys.Rev.
Year: 2010
Vol.: C81
Page No: 064907
Pages: 31

Abstract: Pion production in nuclear collisions at the SPS is investigated with the aim to search, in a restricted domain of the phase diagram, for power-laws in the behavior of correlations which are compatible with critical QCD. We have analyzed interactions of nuclei of different size (p+p, C+C, Si+Si, Pb+Pb) at 158$A$ GeV adopting, as appropriate observables, scaled factorial moments in a search for intermittent fluctuations in transverse dimensions. The analysis is performed for $\pi^+\pi^-$ pairs with invariant mass very close to the two-pion threshold. In this sector one may capture critical fluctuations of the sigma component in a hadronic medium, even if the $\sigma$-meson has no well defined vacuum state. It turns out that for the Pb+Pb system the proposed analysis technique cannot be applied without entering the invariant mass region with strong Coulomb correlations. As a result the treatment becomes inconclusive in this case. Our results for the other systems indicate the presence of power-law fluctuations in the freeze-out state of Si+Si approaching in size the prediction of critical QCD.

Web-Page: http://inspirebeta.net/record/840893/files/fig1.png; http://inspirebeta.net/record/840893/files/fig10nn.png; http://inspirebeta.net/record/840893/files/fig11abcdenn.png; http://inspirebeta.net/record/840893/files/fig2abcdnn.png; http://inspirebeta.net/record/840893/files/fig3abcnn.png; http://inspirebeta.net/record/840893/files/fig4nn.png; http://inspirebeta.net/record/840893/files/fig5abcdnn.png; http://inspirebeta.net/record/840893/files/fig6abcdnn.png; http://inspirebeta.net/record/840893/files/fig7abcdefnn.png; http://inspirebeta.net/record/840893/files/fig8abcdnn.png; http://inspirebeta.net/record/840893/files/fig9abcdnn.png

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