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Bose–Einstein correlations of π^0 pairs from hadronic Z^0 decays
Wilson, Graham Wallace OPAL Collaboration Abbiendi, G. Ainsley, C. Åkesson, P. F. Alexander, G. Allison, J. Amaral, P. Anagnostou, G. Anderson, K. J.
Wilson, Graham Wallace
OPAL Collaboration
Abbiendi, G.
Ainsley, C.
Åkesson, P. F.
Alexander, G.
Allison, J.
Amaral, P.
Anagnostou, G.
Anderson, K. J.
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Abstract
We observe Bose–Einstein correlations in π^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 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 π^0s 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.
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2003-05-01
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Elsevier
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Abbiendi, G. et al. (20030. "Bose–Einstein correlations of π^0 pairs from hadronic Z^0 decays." Physics Letters B, 559(3-4):131-143. http://www.dx.doi.org/10.1016/S0370-2693(03)00337-X.