Imprints of Nonextensivity in Multiparticle Production

Abstract

The statistical methods based on the classical Boltzmann-Gibbs (BG) approach are at heart of essentially all descriptions of multiparticle production processes. In many cases, however, one observes some deviations from the expected behaviour. It is also known that conditions necessary for the BG statistics to apply are usually satisfied only approximately. Two attitudes are possible in such situations: either to abandon statistical approach trying some other model or to generalise it to the so called nonextensive statistics (widely used in the similar circumstances in many other branches of physics). We shall provide here an overview of possible imprints of non-extensitivity existing both in high energy cosmic ray physics and in multiparticle production processes in hadronic collisions, in particular in heavy ion collisions.Comment: LaTeX, 2 PS files with figures, 14 pages altogether. Invited talk presented by G.Wilk at 6th International Workshop on Relativistic Aspects of Nuclear Physics (RANP2000), Caraguatatuba, Tabatinga Beach, Sao Paulo, Brazil, October 17-20, 2000. To be published in the proceedings (World Scientific, Singapore). Minor changes, references update