Intermittency and Bose-Einstein correlations

The role of Bose-Einstein correlations in a widely discussed intermittency phenomenon is reviewed. In particular, it is shown that particle correlations of different origin are better displayed when analysed as functions of appropriately chosen variables. Correspondingly, if the shape of Bose-Einstein contribution is chosen to be Gaussian in 3momentum transferred, it provides the power-like law in 4-momentum squared and is smeared out in (pseudo)rapidity. 1 Introductory survey and definitions. The study of fluctuations and correlations in hadron production at high energies has found considerable interest in recent years. The q-particle inclusive densities ρq(p1, . . . , pq) or rather the factorial moments 〈n(n−1) . . . (n−q+1)〉 estimated in different phase space regions δ were studied in a variety of reactions ranging from ee to nucleus-nucleus scattering. The concept of intermittency has been introduced in order to describe enhanced fluctuations observed for individual events in the density distributions of hadrons (for a recent review see [1]). Originally the definition of intermittency was the strict power laws of the normalized factorial moments taken as a function of bin size [2] at small bin sizes (self-similarity of the