Bose-Einstein correlations of π0 pairs from hadronic Z0 decays

G Abbiendi; C Ainsley; PF Åkesson; G Alexander; J Allison; P Amaral; G Anagnostou; KJ Anderson; S Arcelli; S Asai; D Axen; G Azuelos; I Bailey; E Barberio; RJ Barlow; RJ Batley; P Bechtle; T Behnke; KW Bell; PJ Bell; G Bella; A Bellerive; G Benelli; S Bethke; O Biebel; IJ Bloodworth; O Boeriu; P Bock; D Bonacorsi; M Boutemeur; S Braibant; L Brigliadori; RM Brown; K Buesser; HJ Burckhart; S Campana; RK Carnegie; B Caron; AA Carter; JR Carter; CY Chang; DG Charlton; A Csilling; M Cuffiani; S Dado; A de Roeck; EA de Wolf; K Desch; B Dienes; M Donkers; J Dubbert; E Duchovni; G Duckeck; IP Duerdoth; E Elfgren; E Etzion; F Fabbri; L Feld; P Ferrari; F Fiedler; I Fleck; M Ford; A Frey; A Fürtjes; P Gagnon; JW Gary; G Gaycken; C Geich-Gimbel; G Giacomelli; P Giacomelli; M Giunta; J Goldberg; E Gross; J Grunhaus; M Gruwé; PO Günther; A Gupta; C Hajdu; M Hamann; GG Hanson; K Harder; A Harel; M Harin-Dirac; M Hauschild; CM Hawkes; R Hawkings; RJ Hemingway; C Hensel; G Herten; RD Heuer; JC Hill; K Hodman; RJ Homer; D Horváth; P Igo-Kemenes; K Ishii; H Jeremie; P Jovanovic; TR Junk; N Kanaya

Journal article

Bose-Einstein correlations of π0 pairs from hadronic Z0 decays

G Abbiendi, C Ainsley, PF Åkesson, G Alexander, J Allison, P Amaral, G Anagnostou, KJ Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | Published : 2003

DOI: 10.1016/S0370-2693(03)00337-X

Open access

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. © 2003 Elsevier Science B.V. All rights reserved.