Bose-Einstein Correlations of pi0 Pairs from Hadronic Z0 Decays

Details Bose-Einstein Correlations of pi0 Pairs from Hadronic Z0 Decays Bose-Einstein Correlations of pi0 Pairs from Hadronic Z0 Decays

2003-02-20

arxiv.org/abs/hep-ex/0302027v1

Phys.Lett.B559:131-143,2003

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 5 figures

Scientific paper

10.1016/S0370-2693(03)00337-X

We observed Bose-Einstein correlation in pi0 pairs produced in Z0 decays using 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 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 pi0s originating from the decays of different hadrons. Prompt pions formed at string break-up of cluster decays only form a small fraction of the sample.

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