Fermi-Dirac Correlations in $\Lambda$ Pairs in Hadronic Z Decays

Two-particle correlations of Lambda Lambda and Anti-Lambda Anti-Lambda pairshave 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 e...

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Detalles Bibliográficos
Autores principales: Barate, R, Décamp, D, Ghez, P, Goy, C, Lees, J P, Martin, F, Merle, E, Minard, M N, Pietrzyk, B, Alemany, R, Bravo, S, Casado, M P, Chmeissani, M, Crespo, J M, Fernández, E, Fernández-Bosman, M, Garrido, L, Graugès-Pous, E, Juste, A, Martínez, M, Merino, G, Miquel, R, Mir, L M, Pacheco, A, Riu, I, Ruiz, H, Colaleo, A, Creanza, D, De Palma, M, Iaselli, Giuseppe, Maggi, G, Maggi, M, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Tricomi, A, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Abbaneo, D, Boix, G, Buchmüller, O L, Cattaneo, M, Cerutti, F, Ciulli, V, Dissertori, G, Drevermann, H, Forty, Roger W, Frank, M, Greening, T C, Halley, A W, Hansen, J B, Harvey, J, Janot, P, Jost, B, Lehraus, Ivan, Leroy, O, Mato, P, Minten, Adolf G, Moutoussi, A, Ranjard, F, Rolandi, Luigi, Schlatter, W D, Schmitt, M, Schneider, O, Spagnolo, P, Tejessy, W, Teubert, F, Tournefier, E, Wright, A E, Ajaltouni, Ziad J, Badaud, F, Chazelle, G, Deschamps, O, Falvard, A, Ferdi, C, Gay, P, Guicheney, C, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, J C, Pallin, D, Perret, P, Podlyski, F, Hansen, J D, Hansen, J R, Hansen, P H, Nilsson, B S, Rensch, B, Wäänänen, A, Daskalakis, G, Kyriakis, A, Markou, C, Simopoulou, Errietta, Siotis, I, Vayaki, Anna, Blondel, A, Bonneaud, G R, Brient, J C, Rougé, A, Rumpf, M, Swynghedauw, M, Verderi, M, Videau, H L, Focardi, E, Parrini, G, Zachariadou, K, Corden, M, Georgiopoulos, C H, Antonelli, A, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, G P, Passalacqua, L, Pepé-Altarelli, M, Curtis, L, Lynch, J G, Negus, P, O'Shea, V, Raine, C, Teixeira-Dias, P, Thompson, A S, Cavanaugh, R J, Dhamotharan, S, Geweniger, C, Hanke, P, Hansper, G, Hepp, V, Kluge, E E, Putzer, A, Sommer, J, Tittel, K, Werner, S, Wunsch, M, Beuselinck, R, Binnie, David M, Cameron, W, Dornan, Peter J, Girone, M, Goodsir, S M, Martin, E B, Marinelli, N, Sciabà, A, Sedgbeer, J K, Thomson, E, Williams, M D, Ghete, V M, Girtler, P, Kneringer, E, Kuhn, D, Rudolph, G, Bowdery, C K, Buck, P G, Finch, A J, Foster, F, Hughes, G, Jones, R W L, Robertson, N A, Williams, M I, Giehl, I, Jakobs, K, Kleinknecht, K, Quast, G, Renk, B, Rohne, E, Sander, H G, Wachsmuth, H W, Zeitnitz, C, Aubert, Jean-Jacques, Bonissent, A, Carr, J, Coyle, P, Payre, P, Rousseau, D, Aleppo, M, Antonelli, M, Ragusa, F, Büscher, V, Dietl, H, Ganis, G, Hüttmann, K, Lütjens, G, Mannert, C, Männer, W, Moser, H G, Schael, S, Settles, Ronald, Seywerd, H C J, Stenzel, H, Wiedenmann, W, Wolf, G, Azzurri, P, Boucrot, J, Callot, O, Chen, S, Cordier, A, Davier, M, Duflot, L, Grivaz, J F, Heusse, P, Jacholkowska, A, Le Diberder, F R, Lefrançois, J, Lutz, A M, Schune, M H, Veillet, J J, Videau, I, Zerwas, D, Bagliesi, G, Boccali, T, Bozzi, C, Calderini, G, Dell'Orso, R, Ferrante, I, Foà, L, Giassi, A, Gregorio, A, Ligabue, F, Marrocchesi, P S, Messineo, A, Palla, Fabrizio, Rizzo, G, Sanguinetti, G, Sguazzoni, G, Tenchini, Roberto, Venturi, A, Verdini, P G, Blair, G A, Cowan, G D, Green, M G, Medcalf, T, Strong, J A, Botterill, David R, Clifft, R W, Edgecock, T R, Norton, P R, Thompson, J C, Tomalin, I R, Bloch-Devaux, B, Colas, P, Emery, S, Kozanecki, Witold, Lançon, E, Lemaire, M C, Locci, E, Pérez, P, Rander, J, Renardy, J F, Roussarie, A, Schuller, J P, Schwindling, J, Trabelsi, A, Vallage, B, Black, S N, Dann, J H, Johnson, R P, Kim, H Y, Konstantinidis, N P, Litke, A M, McNeil, M A, Taylor, G, Booth, C N, Cartwright, S L, Combley, F, Lehto, M H, Thompson, L F, Affholderbach, K, Böhrer, A, Brandt, S, Grupen, Claus, Hess, J, Misiejuk, A, Prange, G, Sieler, U, Giannini, G, Gobbo, B, Rothberg, J E, Wasserbaech, S R, Armstrong, S R, Elmer, P, Ferguson, D P S, Gao, Y, González, S, Hayes, O J, Hu, H, Jin, S, Kile, J, McNamara, P A, Nielsen, J, Orejudos, W, Pan, Y B, Saadi, Y, Scott, I J, Walsh, J, Von Wimmersperg-Töller, J H, Wu Sau Lan, Wu, X, Zobernig, G
Lenguaje:eng
Publicado: 1999
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(00)00080-0
http://cds.cern.ch/record/421565
Descripción
Sumario:Two-particle correlations of Lambda Lambda and Anti-Lambda Anti-Lambda pairshave 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 Anti-Lambda 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.

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