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Measurement of the $\bar{B}^{0}$ and $B^{-}$ Meson Lifetimes

By R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, E. Merle, M N. Minard, B. Pietrzyk, S. Bravo, M P. Casado, M. Chmeissani, J M. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Grauges, M. Martinez, G. Merino, R. Miquel, L M. Mir, A. Pacheco, 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, Jiali Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, G. Boix, O. Buchmuller, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R W. Forty, M. Frank, T C. Greening, J B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmitt, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, A E. Wright, Ziad Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, Alain Falvard, Pascal Gay, C. Guicheney, Pierre Henrard, J. Jousset, B. Michel, S. Monteil, Jean-Claude Montret, D. Pallin, Pascal Perret, F. Podlyski, J D. Hansen, J R. Hansen, P H. Hansen, B S. Nilsson, A. Waananen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, G. Bonneaud, J C. Brient, A. Rouge, M. Rumpf, M. Swynghedauw, M. Verderi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, A. Antonelli, M. 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. Pepe-Altarelli, A W. Halley, J G. Lynch, P. Negus, V. O'Shea, C. Raine, P. Teixeira-Dias, A S. Thompson, R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E E. Kluge, A. Putzer, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D M. Binnie, W. Cameron, P J. Dornan, M. Girone, N. Marinelli, J K. Sedgbeer, J C. Thompson, 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, I. Giehl, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H G. Sander, H. Wachsmuth, C. Zeitnitz, A. Bonissent, J. Carr, P. Coyle, O. Leroy, P. Payre, D. Rousseau, M. Talby, M. Aleppo, F. Ragusa, H. Dietl, G. Ganis, A. Heister, K. Huttmann, G. Lutjens, C. Mannert, W. Manner, H G. Moser, S. Schael, R. Settles, 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, C. Yuan, D. Zerwas, G. Bagliesi, T. Boccali, G. Calderini, V. Ciulli, L. Foa, A. Giassi, F. Ligabue, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, A. Sciaba, G. Sguazzoni, R. Tenchini, A. Venturi, P G. Verdini, G A. Blair, G. Cowan, M G. Green, T. Medcalf, J A. Strong, J H. Von Wimmersperg-Toller, R W. Clifft, T R. Edgecock, P R. Norton, I R. Tomalin, B. Bloch-Devaux, 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. Taylor, C N. Booth, S. Cartwright, F. Combley, M H. Lehto, L F. Thompson, K. Affholderbach, A. Bohrer, S. Brandt, C. Grupen, A. Misiejuk, G. Prange, U. Sieler, G. Giannini, B. Gobbo, J E. Rothberg, S. Wasserbaech, S R. Armstrong, K. Cranmer, P. Elmer, D P S. 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, S L. Wu, X. Wu and G. Zobernig

Abstract

The lifetimes of the B0 and B- mesons are measured using a sample of about four million hadronic Z decays collected from 1991 to 19 95 with the ALEPH detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of B0 and B- mesons are partially reconstructed by identifying events containing a lepton with an associated D* or D0 meson. The proper time of the B meson is estimated from the measured decay length and the momentum of the D-lepton system. A fit to the proper time of 1880 D* l- and 2856 D0 l- candidates yields the following results: tau B0 = 1.518 +- 0.053 +- 0.034 ps, tau B- = 1.648 +- 0.049 +- 0.035 ps, tau B- / tau B0 = 1.085 +- 0.059 +- 0.018

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'Elsevier BV'
Year: 2000
OAI identifier: oai:HAL:in2p3-00007861v1
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