Search for critical fluctuations of the proton density in central A+A collisions at maximum SPS energy

Nikolaos Antoniou 1 , Nikos Davis 1 ,  and Fotis Diakonos 1
  • 1 Department of Physics, wUniversity of Athens, GR-15771, Athens, Greece

Abstract

We performed an intermittency analysis of the proton density fluctuations in transverse momentum space for the collisions Si+A (A=Al,Si,P) and C+A (A=C,N) at maximum SPS energy $\sqrt {s_{NN} } $ ≈ 17 GeV). In our analysis we used exclusively proton tracks in the midrapidity region (|y CM| ≤ 0.75). For the Si+A system we find signature of power-law distributed density fluctuations quantified by the intermittency index ϕ 2 which approaches in size the predictions of critical QCD [Phys. Rev. Lett. 97, 032002 (2006)]. This result supports further the recent findings of power-law fluctuations in the density of (π +, π −) pairs with invariant mass close to their production threshold for the Si+Si at the same energy, reported in [Phys. Rev. C 81, 064907 (2010)].

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  • [1] P. Seyboth, Nucl. Phys. A 862, 54 (2011) http://dx.doi.org/10.1016/j.nuclphysa.2011.05.020

  • [2] M. Gazdzicki, J. Phys. G 38, 124024 (2011) http://dx.doi.org/10.1088/0954-3899/38/12/124024

  • [3] M. A. Stephanov, K. Rajagopal, E. V. Shuryak, Phys. Rev. Lett. 81, 4816 (1998) http://dx.doi.org/10.1103/PhysRevLett.81.4816

  • [4] H. Fujii, Phys. Rev. D 67, 094018 (2003) http://dx.doi.org/10.1103/PhysRevD.67.094018

  • [5] M. A. Stephanov, Phys. Rev. Lett. 102, 032301 (2009) http://dx.doi.org/10.1103/PhysRevLett.102.032301

  • [6] B. Mohanty, Nucl. Phys. A 830, 899c (2009) http://dx.doi.org/10.1016/j.nuclphysa.2009.10.132

  • [7] Y. Hatta, M. A. Stephanov, Phys. Rev. Lett. 91, 102003 (2003) http://dx.doi.org/10.1103/PhysRevLett.91.102003

  • [8] N. G. Antoniou, Y. F. Contoyiannis, F. K. Diakonos, A. I. Karanikas, C. N. Ktorides, Nucl. Phys. A 693, 799 (2001) http://dx.doi.org/10.1016/S0375-9474(01)00921-6

  • [9] N. G. Antoniou, Y. F. Contoyiannis, F. K. Diakonos, G. Mavromanolakis, Nucl. Phys. A 761, 149 (2005) http://dx.doi.org/10.1016/j.nuclphysa.2005.07.003

  • [10] K. Fukushima, T. Hatsuda, Rep. Prog. Phys. 74, 014001 (2011) http://dx.doi.org/10.1088/0034-4885/74/1/014001

  • [11] D. Bower, S. Gavin, Phys. Rev. C 64, 051902(R) (2001) http://dx.doi.org/10.1103/PhysRevC.64.051902

  • [12] N. G. Antoniou, Nucl. Phys. B-Proc. Sup. 92, 26 (2001) http://dx.doi.org/10.1016/S0920-5632(00)01016-1

  • [13] N. G. Antoniou, Acta Phys. Pol. B 33, 1521 (2002)

  • [14] Y. Hatta, T. Ikeda, Phys. Rev. D 67, 014028 (2003) http://dx.doi.org/10.1103/PhysRevD.67.014028

  • [15] M. A. Stephanov, Int. J. Mod. Phys. A 20, 4387 (2005) http://dx.doi.org/10.1142/S0217751X05027965

  • [16] M. M. Aggarwal et al., Phys. Rev. Lett. 105, 022302 (2010) http://dx.doi.org/10.1103/PhysRevLett.105.022302

  • [17] B. Wosiek, Acta Phys. Pol. B 21, 1021 (1990)

  • [18] K. M. Wolter, Introduction to Variance Estimation, 2nd edition, (Springer, New York, 2007)

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