Bose-Einstein Correlations of pi0 Pairs from Hadronic Z0 Decays G Abbiendi , T E Marchant , S Arcelli , Ch Geichgimbel , Y Rozen , M Boutemeur , H J Burckhart , D Axen , W G Scott , P Mendezlorenzo , P Vannerem , P Mattig , S Dallison , K Sachs , I Fleck , J Polok , G Giacomelli , W Mohr , F Meijers , A Leins , O Boeriu , G N Patrick , D Bonacorsi , P O Gunther , D Krop , S Mihara , A Klier , P F Akesson , M Cuffiani , G Duckeck , R Keeler , R A Mcpherson , A Okpara , M Tasevsky , E Torrence , E Tsur , M Gruwe , T J Mcmahon , S Kluth , Richard Batley , T Shears , P Tran , M Kupper , A Quadt , N Wermes , J R Pater , L Zivkovic , S Yamashita , M Harindirac , R J Barlow , M Giunta , C Hensel , I P Duerdoth , J Grunhaus , R D Heuer , G Karapetian , W Menges , G Alexander , R Seuster , S Soldnerrembold , B C Shen , K D Hoffman , B Poli , E Elfgren , S Komamiya , D Waller , K Stephens , M Schroder , T Saeki , G Herten , D H Kim , T Kawamoto , K W Bell , C Schwick , K J Anderson , G W Wilson , S Bethke , G G Hanson , Ikuo Ueda , B Ujvari , A De Roeck , R J Homer , S Campana , T Mashimo , J M Roney , S Dado , P Igokemenes , C Hajdu , J A Wilson , M Hamann , R K Carnegie , T R Wyatt , P Bock , J P Martin , R Nisius , B Dienes , Jing Lu , T Behnke , G Bella , L Brigliadori , P Scharffhansen , P Ferrari , G Mikenberg , H A Neal , G Azuelos , T Kobayashi , A Furtjes , J Ludwig , L Levinson , R Sobie , J Lettso , S Marcellini , S W Oneale , O Biebel , J Von Krogh , A Martin , L L Kormos , O Pooth , E Duchovni , P Bechtle , F Fabbri , T Mori , P Krieger , M Kobel , J C Hill , M Hauschild , M F Turnerwatson , J Lillich , P Renkel , J Kanzaki , A T Watson , A Macpherson , W J Mcdonald , P J Bell , S L Lloyd , K Buesser , D Toya , E Barberio , G Anagnostou , J W Gary , B W Kennedy , B Caron , D Wetterling , A Tricoli , G P Siroli , P M Watkins , Robert M Brown , F Fiedler , K Harder , A Bellerive , W F Mader , E A De Wolf , C M Hawkes , A Harel , F K Loebinger , R Strohmer , M Verzocchi , J Dubbert , Gabriella Pasztor , K Ishii , M Przybycien , S Rosati , C Rembser , D Lellouch , G Masetti , A Stahl , Francesco Spano , J R Carter , S Moed , M Ford , Dezso Horvath , M Schumacher , A D Schaile , Isabel Marian Trigger , Pauline Gagnon , D E Plane , R Howard , I J Bloodworth , M Donkers , A Oh , P Giacomelli , D J Miller , Eilam Gross , Mark Thomson , N K Watson , J Hauschildt , T R Junk , R J Taylor , T Kramer , P Sherwood , C P Ward , Katja Klein , E K G Sarkisyan , A Mutter , L Feld , K Rabbertz , R G Kellogg , J G Layter , T Kuhl , A A Carter , H Mes , R J Teuscher , S Asai , I Nakamura , Thomas Schoernersadenius , C Y Chang , S Tarem , P Jovanovic , B Vachon , E Etzion , Christoph Pahl , Richard John Hawkings , F S Merritt , H Rick , D Strom , S Orito , C Ainsley , K Runge , A M Smith , A Csilling , O Sahr , J L Pinfold , Vakhtang Kartvelishvili , G Gaycken , T Trefzger , J Goldberg , J H Vossebeld , J Schieck , K Desch , T Wengler , C F Vollmer , Atul Gupta , K Nagai , G Benelli , I Bailey , D Lanske , D R Ward , A Skuja , D Karlen , P Amaral , J A Mckenna , M J Oreglia , R J Hemingway , H Jeremie , K Kruger , D Zerzion , H Voss , K Kawagoe , A Michelini , N Kanaya , T Kress , H Landsman , O Schaile , S Braibant , J Allison , P S Wells , G K Wolf , D G Charlton , G D Lafferty , A Frey , Zoltan Laszlo Trocsanyi , J E Pilcher Physics Letters B（2003）
摘要
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.
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