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Bose–Einstein correlations of π0 pairs from hadronic Z0 decays.

Research output: Contribution to journalJournal article

Published

Journal publication date1/05/2003
JournalPhysics Letters B
Journal number3-4
Volume559
Number of pages13
Pages131-143
Original languageEnglish

Abstract

We observe Bose–Einstein correlations in π0 pairs using back-to-back two jet hadronic events from Z0 decays in the data sample collected by the OPAL detector at LEP 1 from 1991 to 1995. Using a static Gaussian picture for the pion emitter source, we obtain the chaoticity parameter λ=0.55±0.10±0.10 and the source radius R=(0.59±0.08±0.05) fm. According to the JETSET and HERWIG Monte Carlo models, the Bose–Einstein correlations in our data sample largely connect π0s originating from the decays of different hadrons. Prompt pions formed at string break-ups or cluster decays only form a small fraction of the sample.