Bose-Einstein correlation is discussed for particles produced by rapidly expanding sources, when kinematical effects hinder a direct relation between the observed correlations and the source dimensions. Some of these effects are illustrated by considering Landau’s hydrodynamical model wherein each space-time point of the fluid with temperature T=$T_c$≃$m_{\pi }$ is taken as an independent and chaotic emitting center with a Planck spectral distribution. In particular, this model reproduces surprisingly well the observed π-π and K-K correlations at the CERN ISR.

• Received 3 December 1987

DOI:https://doi.org/10.1103/PhysRevD.37.3237