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24 April 2024

» arxiv » 1208.5292

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Critical fluctuations of the proton density in A+A collisions at $158A$ GeV
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 ;
Date:	27 Aug 2012
Abstract:	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.
Source:	arXiv, 1208.5292
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