Study of the B<sup>0</sup><inf>s</inf>B<sup>0</sup><inf>s</inf> oscillation frequency using D<sup>-</sup><inf>s</inf> ℓ<sup>+</sup> combinations in Z decays

D. Buskulic, I. de Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, P. Odier, B. Pietrzyk, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, LI Garrido, A. Juste, M. MartinezS. Orteu, A. Pacheco, C. Padilla, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, R. Alemany, A. O. Bazarko, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, G. Lutters, E. B. Martin, P. Mato, A. Minten, R. Miquel, L. M. Mir, L. Moneta, T. Oest, J. R. Pater, J. F. Pusztaszeri, F. Ranjard, P. Rensing, L. Rolandi, D. Schlatter, M. Schmelling, O. Schneider, W. Tejessv, I. R. Tomalin, A. Venturi, H. Wachsmuth, A. Wagner, T. Wildish, Z. Ajaltouni, A. Barrès, C. Boyer, A. Falvard, P. Gay, C. Guicheney, P. Henrard

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Abstract

A lower limit on the oscillation frequency of the B0SB0S system is obtained from approximately four million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1995. Leptons are combined with opposite sign D-S candidates reconstructed in seven different decay modes as evidence of semileptonic B0S decays. Criteria designed to ensure precise proper time reconstruction select 277 D-Sl+ combinations. The initial state of these B0S candidates is determined using an algorithm optimized to efficiently utilise the tagging information available for each event. The limit at 95% confidence level on the B0SB0S oscillation frequency is Δms > 6.6 ps-1. The same data is used to update the measurement of the B0S lifetime, τs = 1.54 +0.14-0.13, (stat) ± 0.04 (syst) ps.
Original languageEnglish
Pages (from-to)205-221
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume377
Issue number1-3
DOIs
Publication statusPublished - 6 Jun 1996

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