2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 12, 499-506
DOI 10.1007/s100529900220

Non-extensive statistics, fluctuations and correlations
in high-energy nuclear collisions

W.M. Alberico1,3 - A. Lavagno2,3 - P. Quarati2,4

1 Dipartimento di Fisica, Università di Torino, Via P. Giuria 1, 10125 Torino, Italy
2 Dipartimento di Fisica, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
3 Istituto Nazionale di Fisica Nucleare, Sezione di Torino
4 Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari

Received: 6 June 1999 / Published online: 21 December 1999

Starting from the experimental evidence that high-energy nucleus-nucleus collisions cannot be described in terms of superpositions of elementary nucleon-nucleon interactions, we analyze the possibility that memory effects and long-range forces imply a non-extensive statistical regime during high-energy heavy-ion collisions. The relevance of these statistical effects and their compatibility with the available experimental data are discussed. In particular, we show that theoretical estimates obtained in the framework of the generalized non-extensive thermostatistics, can reproduce the shape of the pion transverse mass spectrum and explain the different physical origin of the transverse momentum correlation function of the pions emitted during the central Pb+Pb and during the p+p collisions at 158GeV.

Copyright Springer-Verlag 2000