Fermi–Dirac correlations in Λ pairs in hadronic Z decays R Barate , D Decamp , P Ghez , C Goy , J P Lees , F Martin , E Merle , M N Minard , B Pietrzyk , R Alemany , S Bravo , M P Casado , M Chmeissani , J M Crespo , E Fernandez , M Fernandezbosman , L Garrido , E Grauges , A Juste , M Martinez , G Merino , R Miquel , Ll M Mir , A Pacheco , I Riu , H Ruiz , A Colaleo , D Creanza , M De Palma , G Iaselli , G Maggi , M Maggi , S Nuzzo , A Ranieri , G Raso , F Ruggieri , G Selvaggi , L Silvestris , P Tempesta , A Tricomi , G Zito , X Huang , Jie Lin , Q Ouyang , Tao Wang , Y Xie , Ruian Xu , Song Xue , J Zhang , Luyong Zhang , Wenwu Zhao , D Abbaneo , G Boix , O Buchmuller , M Cattaneo , F Cerutti , V Ciulli , G Dissertori , H Drevermann , R Forty , M Frank , T C Greening , A W Halley , J Harvey , P Janot , B Jost , I Lehraus , O Leroy , P Mato , A Minten , A Moutoussi , F Ranjard , L Rolandi , D Schlatter , M Schmitt , O Schneider , Paolo Spagnolo , W Tejessy , F Teubert , E Tournefier , A E Wright , Z Ajaltouni , F Badaud , G Chazelle , O Deschamps , A Falvard , C Ferdi , P Gay , C Guicheney , P Henrard , J Jousset , Bernd Michel , S Monteil , J C Montret , D Pallin , P Perret , F Podlyski , J R Hansen , P H Hansen , B S Nilsson , B Rensch , A Waananen , G Daskalakis , A Kyriakis , C Markou , E Simopoulou , I Siotis , A Vayaki , A Blondel , G R Bonneaud , J C Brient , A Rouge , M Rumpf , M Swynghedauw , M Verderi , H Videau , E Focardi , G Parrini , K Zachariadou , M Corden , C Georgiopoulos , A Antonelli , G Bencivenni , G Bologna , F Bossi , P Campana , G Capon , V Chiarella , P Laurelli , G Mannocchi , F Murtas , G P Murtas , L Passalacqua , M Pepealtarelli , L Curtis , J G Lynch , P Negus , V Oshea , C Raine , P Teixeiradias , A S Thompson , Richard Cavanaugh , S Dhamotharan , C Geweniger , P Hanke , G Hansper , V Hepp , E E Kluge , A Putzer , J Sommer , K Tittel , Stefan Werner , M Wunsch , R Beuselinck , D M Binnie , W Cameron , P J Dornan , M Girone , S Goodsir , E B Martin , N Marinelli , A Sciaba , J K Sedgbeer , E Thomson , V M Ghete , P Girtler , E Kneringer , D Kuhn , G Rudolph , C K Bowdery , P G Buck , A J Finch , F Foster , G Hughes , R W L Jones , N A Robertson , M I Williams , I Giehl , K Jakobs , K Kleinknecht , G Quast , B Renk , E Rohne , H G Sander , H Wachsmuth , C Zeitnitz , J J Aubert , A Bonissent , Jillian M Carr , P Coyle , P Payre , David Rousseau , M Aleppo , M Antonelli , F Ragusa , V Buscher , H Dietl , G Ganis , K Huttmann , G Lutjens , C Mannert , W Manner , H G Moser , S Schael , R Settles , H Seywerd , H Stenzel , W Wiedenmann , G Wolf , P Azzurri , J Boucrot , O Callot , S Chen , A Cordier , M Davier , L Duflot , J F Grivaz , P Heusse , A Jacholkowska , F Le Diberder , J Lefrancois , A M Lutz , M H Schune , J J Veillet , I Videau , D Zerwas , G Bagliesi , T Boccali , C Bozzi , G Calderini , R Dellorso , I Ferrante , L Foa , A Giassi , A Gregorio , F Ligabue , P S Marrocchesi , A Messineo , F Palla , G Rizzo , G Sanguinetti , G Sguazzoni , R Tenchini , A Venturi , P G Verdini , G A Blair , Glen Cowan , M G Green , T Medcalf , J A Strong , D R Botterill , R W Clifft , T R Edgecock , P R Norton , J C Thompson , I R Tomalin , B Blochdevaux , P Colas , S Emery , W Kozanecki , E Lancon , M C Lemaire , E Locci , P Perez , J Rander , J F Renardy , A Roussarie , J P Schuller , J Schwindling , A Trabelsi , B Vallage , S N Black , J H Dann , R P Johnson , H Y Kim , N Konstantinidis , A M Litke , M A Mcneil , G N Taylor , C N Booth , S Cartwright , F Combley , M H Lehto , L F Thompson , K Affholderbach , A Bohrer , S Brandt , C Grupen , J Hess , A Misiejuk , G Prange , U Sieler , G Giannini , B Gobbo , J Rothberg , S Wasserbaech , S R Armstrong , P Elmer , D Ferguson , Y Gao , S Gonzalez , O J Hayes , H Hu , S Jin , J Kile , P A Mcnamara , J Nielsen , W Orejudos , Y B Pan , Y Saadi , I J Scott , J Walsh , J H Von Wimmerspergtoeller , Sau Lan Wu , X Wu , G Zobernig PHYSICS LETTERS B（2000）
摘要
Two-particle correlations of Lambda Lambda and <(Lambda)over bar><(Lambda)over bar> pairs have been studied in multihadronic Z decays recorded with the ALEPH detector at LEP in the years from 1992 to 1995. The correlations were measured as a function of the four-momentum difference Q of the pair. A depletion of events is observed in the region Q < 2 GeV which could arise from the effects of Fermi-Dirac statistics. In addition the spin content of the Lambda pair system has been determined. For Q > 2 GeV the fraction of pairs with spin one is consistent with the value of 0.75 expected for a statistical spin mixture, whilst for Q < 2 GeV this fraction is found to be lower. For Lambda<(Lambda)over bar> pairs, where no Fermi-Dirac correlations are expected, the spin one fraction is measured to be consistent with 0.75 over the entire analysed Q range. (C) 2000 Elsevier Science B.V. All rights reserved.
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