Bose-Einstein correlations of Pizero pairs from hadronic Z⁰ decays

G Abbiendi, Georgios Anagnostou, Paul Bell, Ian Bloodworth, David Charlton, Christopher Hawkes, Roger Homer, Predrag Jovanovic, Thomas McMahon, Stephen O'Neale, Miriam Watson, Peter Watkins, Alan Watson, Nigel Watson, John Wilson

Research output: Contribution to journalArticle

20 Citations (Scopus)


We observe Bose-Einstein correlations in pi(0) pairs using back-to-back two jet hadronic events from Z(0) decays in the data sample collected by the OPAL detector at LEP I from 101 to 1995. Using a static Gaussian picture for the pion emitter source, we obtain the chaoticity parameter lambda = 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 pi(0)s 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. (C) 2003 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)131-143
Number of pages13
JournalPhysics Letters B
Issue number3-4
Publication statusPublished - 1 May 2003


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