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Measurement of the transverse spin correlations in the decay $Z \rightarrow \tau^+\tau^-$
Authors :
Barate, R Buskulic, Damir Décamp, D Ghez, P Goy, C Lees, J P Lucotte, A Minard, M N Nief, J Y Pietrzyk, B Casado, M P Chmeissani, M Comas, P Crespo, J M Delfino, M C Fernández, E Fernández-Bosman, M Garrido, L Juste, A Martínez, M Miquel, R Mir, L M Orteu, S Padilla, C Park, I C Pascual, A Perlas, J A Riu, I Sánchez, F Teubert, F Colaleo, A Creanza, D De Palma, M Gelao, G Iaselli, Giuseppe Maggi, G Maggi, M Marinelli, N 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 Alemany, R Becker, U Bazarko, A O Bright-Thomas, P G Cattaneo, M Cerutti, F Dissertori, G Drevermann, H Forty, Roger W Frank, M Hagelberg, R Hansen, J B Harvey, J Janot, P Jost, B Kneringer, E Knobloch, J Lehraus, Ivan Lutters, G Mato, P Minten, Adolf G Moneta, L Pacheco, A Pusztaszeri, J F Ranjard, F Rizzo, G Rolandi, Luigi Rousseau, D Schlatter, W D Schmitt, M Schneider, O Tejessy, W Tomalin, I R Wachsmuth, H W Wagner, A Ajaltouni, Ziad J Barrès, A Boyer, C 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 Proriol, J Rosnet, P Rossignol, J M Fearnley, Tom 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 Bourdon, P Rougé, A Rumpf, M Valassi, Andrea Verderi, M Videau, H L Candlin, D J Parsons, M I Focardi, E Parrini, G Zachariadou, K Corden, M Georgiopoulos, C H Jaffe, D E Antonelli, A Bencivenni, G Bologna, G Bossi, F Campana, P Capon, G Casper, David William Chiarella, V Felici, G Laurelli, P Mannocchi, G Murtas, F Murtas, G P Passalacqua, L Pepé-Altarelli, M Curtis, L Dorris, S J Halley, A W Knowles, I G Lynch, J G O'Shea, V Raine, C Scarr, J M Smith, K Teixeira-Dias, P Thompson, A S Thomson, E Thomson, F Turnbull, R M Geweniger, C Graefe, G Hanke, P Hansper, G Hepp, V Kluge, E E Putzer, A Schmidt, M 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 Moutoussi, A Nash, J Sedgbeer, J K Spagnolo, P Stacey, A M Williams, M D Ghete, V M Girtler, P Kuhn, D Rudolph, G Betteridge, A P Bowdery, C K Colrain, P Crawford, G Finch, A J Foster, F Hughes, G Jones, R W L Sloan, Terence Williams, M I Galla, A Giehl, I Greene, A M Hoffmann, C Jakobs, K Kleinknecht, K Quast, G Renk, B Rohne, E Sander, H G Van Gemmeren, P Zeitnitz, C Aubert, Jean-Jacques Benchouk, C Bonissent, A Bujosa, G Calvet, D Carr, J Coyle, P Diaconu, C A Etienne, F Konstantinidis, N P Leroy, O Motsch, F Payre, P Talby, M Sadouki, A Thulasidas, M Trabelsi, K Aleppo, M Ragusa, F Berlich, R Blum, Walter Büscher, V Dietl, H Ganis, G Gotzhein, C Kroha, H Lütjens, G Lutz, Gerhard Männer, W Moser, H G Richter, R H Rosado-Schlosser, A Schael, S Settles, Ronald Seywerd, H C J Saint-Denis, R Stenzel, H Wiedenmann, W Wolf, G Boucrot, J Callot, O Chen, S Choi, Y Cordier, A Davier, M Duflot, L Grivaz, J F Heusse, P Höcker, A Jacholkowska, A Jacquet, M Kim, D W Le Diberder, F R Lefrançois, J Lutz, A M Nikolic, I A Schune, M H Simion, S Tournefier, E Veillet, J J Videau, I Zerwas, D Azzurri, P Bagliesi, G Batignani, G Bettarini, S Bozzi, C Calderini, G Carpinelli, M Ciocci, M A Ciulli, V Dell'Orso, R Fantechi, R Ferrante, I Foà, L Forti, F Giassi, A Giorgi, M A Gregorio, A Ligabue, F Lusiani, A Marrocchesi, P S Messineo, A Palla, Fabrizio Sanguinetti, G Sciabà, A Steinberger, Jack Tenchini, Roberto Tonelli, G Vannini, C Venturi, A Verdini, P G Blair, G A Bryant, L M Chambers, J T Gao, Y Green, M G Medcalf, T Perrodo, P Strong, J A Von Wimmersperg-Töller, J H Botterill, David R Clifft, R W Edgecock, T R Haywood, S Maley, P Norton, P R Thompson, J C Wright, A E 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 Litke, A M McNeil, M A Taylor, G Booth, C N Boswell, R Brew, C A J Cartwright, S L Combley, F Kelly, M S Lehto, M H Newton, W M Reeve, J Thompson, L F Böhrer, A Brandt, S Cowan, G D Grupen, Claus Saraiva, P Smolik, L Stephan, F Apollonio, M Bosisio, L Della Marina, R Giannini, G Gobbo, B Musolino, G Rothberg, J E Wasserbaech, S R Armstrong, S R Charles, E Elmer, P Ferguson, D P S González, S Greening, T C Hayes, O J Hu, H Jin, S McNamara, P A Nachtman, J M Nielsen, J Orejudos, W Pan, Y B Saadi, Y Scott, I J Walsh, J Wu Sau Lan Wu, X Yamartino, J M Zobernig, G Laboratoire d'Annecy de Physique des Particules (LAPP) Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Laboratoire Leprince-Ringuet (LLR) Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3) Centre de Physique des Particules de Marseille (CPPM) Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) ALEPH Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Source :
Physics Letters B, Physics Letters B, Elsevier, 1997, 405, pp.191-201, Physics Letters B, 1997, 405, pp.191-201, HAL
Publication Year :
1997
Publisher :
HAL CCSD, 1997.
Abstract
For tau leptons produced in e^+e^- -> tau^+ tau^- interactions there are, in addition to the longitudinal spin correlations, two independent transverse spin correlations associated with the transverse (within the production plane) and normal (to the production plane) polarization components. A measurement of the transverse-transverse and transverse-normal tau spin correlations in the decay Z -> tau^+ tau^-, C_{TT} and C_{TN}, is presented based on the aplanarity angle of the decay products of both tau leptons. Using 80 pb^{-1} of data collected by ALEPH on the peak of the Z resonance, the results are C_{TT} = 1.06 +- 0.13 (stat) +- 0.05 (syst), and C_{TN} = 0.08 +- 0.13 (stat) +- 0.04 (syst). These values are in agreement with the Standard Model predictions, C_{TT} = 0.99 and C_{TN} = -0.01.
Details
Language :
English
ISSN :
03702693
Database :
OpenAIRE
Journal :
Physics Letters B, Physics Letters B, Elsevier, 1997, 405, pp.191-201, Physics Letters B, 1997, 405, pp.191-201, HAL
Accession number :
edsair.dedup.wf.001..a90d968fd9d61be26f7df0e3797ada83