Marcin Kucharczyk

Determination of Hadron Emitter Radii in Z^0 Decays to Hadrons at Lep: Doctoral Thesis Performed in the Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Science, Krakow Marcin Kucharczyk

The present thesis concerns the studies on the Bose-Einstein correlations for pions and Fermi-Dirac correlations for antiprotons and protons. The spatial transverse radius of the pion source was determined at $R_{\bot}=0.591 \pm 0.015(stat) \pm 0.034(syst)$ fm, while the source radius for antiprotons at $R = 0.16 \pm 0.04(stat) \pm 0.03(syst)$ fm. The measurements under consideration were performed using data collected by the DELPHI experiment at LEP. The results of both the author's analyses and other LEP studies established strong dependence of the correlation radius on hadron rest mass. The correlation radii for pions, kaons, protons and $\Lambda$ hyperons were estimated on the basis of correlation functions, which were determined within the model by A. Bia\l{}as and K. Zalewski describing the above dependence. Predictions of the model proved to be consistent with the experimental results.