T. Anticic, B. Baatar, D. Barna, J. Bartke, J. Beck, L. Betev, H. Białkowska, C. Blume, M. Bogusz, B. Boimska, J. Book, M. Botje, P. Bunčić, T. Cetner, P. Christakoglou, P. Chung, O. Chvala, J. Cramer, V. Eckardt, Z. Fodor, P. Foka, V. Friese, M. Gaździcki, K. Grebieszkow, C. Höhne, K. Kadija, A. Karev, V. I. Kolesnikov, M. Kowalski, D. Kresan, A. Laszlo, R. Lacey, M. van Leeuwen, M. Maćkowiak-Pawłowska, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, M. Mitrovski, St. Mrówczyński, G. Pálla, A. D. Panagiotou, W. Peryt, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, H. Ströbele, T. Susa, M. Szuba, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, Z. Włodarczyk, A. Wojtaszek-Szwarć, N. G. Antoniou, N. Davis, F. K. Diakonos
Studies of QCD suggest the existence of a critical point in the phase diagram of strongly interacting matter. Close to this point, according to recent theoretical investigations, the net-proton density carries the critical fluctuations of the chiral order parameter. Using intermittency analysis in the transverse momentum phase space of protons produced around midrapidity in the 12.5% most central C+C, Si+Si and Pb+Pb collisions at the maximum SPS energy of 158$A$ GeV we find evidence of power-law fluctuations for the Si+Si and Pb+Pb data. The fitted power-law exponent approaches the value expected for critical fluctuations. This suggests that the freeze-out states of these two systems are located in the phase diagram in the neighbourhood of the chiral critical point.
View original:
http://arxiv.org/abs/1208.5292
No comments:
Post a Comment