Borysova M. Correlations of identical particles in high energy heavy ion collisions.

The main goal of the thesis is the study of the final stage of evolution of dense matter formed in A+A collisions. Since single- and many-particle spectra of pions and other hadrons are formed at this stage, its restoration is carried out basing on detailed analysis of observable hadron momentum distributions and correlation functions of identical pions. It is founded that the observable spectra can be expressed by means of the Landau/Cooper-Frye prescription. Single particle momentum spectra and interferometry radii collisions were analyzed within hydro-inspired parameterization accounting for continuous emission of hadrons through the whole lifetime of hydrodynamically expanding fireball. It was found that satisfactory description of the data is achieved for physically reasonable set of parameters if the emission from non space-like sectors of enclosed freeze-out hypersurface is fairly long. This protracted surface emission is compensated in outward interferometry radii by positive correlations thatare the result of an intensive transverse expansion. The main features of the experimental data are reproduced: in particular, the obtained ratio of the outward to sideward interferometry radii is less than unity and decreases with increasing transverse momenta of pion pairs. The extracted value of temperature of emission from the surface of hydrodynamic tube approximately coincides with one found at chemical freeze-out in RHIC Au+Au collisions. This could indicate a transformation of quark-gluon matter to hadron gas at the periphery of the system. The role of resonances in formation of transverse spectra and an interferometry volume of pions in A+A collisions was analysed.