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
Abstract
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
