Year: 2000
Type: article
Abstract: The influence of multiboson effects on pion multiplicities, single-pion spectra, and two-pion correlation functions is discussed in terms of an analytically solvable model. The applicability of its basic factorization assumption is clarified. An approximate scaling of the basic observables with the phase space density is demonstrated in the low density (gas) limit. This scaling and also its violation at high densities due to the condensate formation is described by approximate analytical formulas which allow, in principle, for the identification of the multiboson effects among others. For moderate densities indicated by the experimental data, a fast saturation of multiboson effects with the number of contributing cumulants is obtained, allowing for the account of these effects in realistic transport code simulations. At high densities, the spectra are mainly determined by the universal condensate term and the initially narrow Poisson multiplicity distribution approaches a wide Bose-Einstein one. As a result, the intercepts of the inclusive and fixed-$n$ correlation functions (properly normalized to 1 at large relative momenta) approach 2 and 1, respectively, and their widths logarithmically increase with the increasing phase space density. It is shown that the neglect of energy-momentum constraints in the model is justified except near a multipion threshold, where these constraints practically exclude the possibility of a very cold condensate production. It is argued that spectacular multiboson effects are likely to be observed only in the rare events containing sufficiently high density (speckle) fluctuations.
Source: Physical Review C
Authors: R. Lednicky, V. Lyuboshitz, K. Mikhailov, Yu. Sinyukov, A. Stavinsky, B. Erazmus
Institutions: Centre National de la Recherche Scientifique, Laboratoire de Physique Subatomique et des Technologies Associées, FZU - Institute of Physics of the Czech Academy of Sciences, Institut National de Physique Nucléaire et de Physique des Particules, Joint Institute for Nuclear Research, Institute for Theoretical and Experimental Physics
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1984709339