A study of the decay width difference in the b(s)/0-B̄(s)/0 system using φφ correlations Aleph collaboration

R. Barate, D. Decamp, P. Ghez, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, R. Alemany, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Graugés, M. Martinez, G. Merino, R. MiquelL. 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, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, T. C. Greening, A. W. Halley, 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, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, F. Podlyski, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, A. Wäänänen, G. Daskalakis, A. Kyriakis, C. Markou

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In a data sample of about four million hadronic Z decays recorded with the ALEPH detector from 1991 to 1995, the B(s)/0→D(s)/((*))+D(s)/((*))- decay is observed, based on tagging the final state with two φ mesons in the same hemisphere. The D(s)/((*))+D(s)/((*))- final state is mostly CP even and corresponds to the short-lived B(s)/0 mass eigenstate. The branching ratio of this decay is measured to be BR(B(s)/0(short) → D(s)/((*))+D(s)/((*))-) = (23 ± 10-9/+19)%. A measurement of the lifetime of the B(s)/0(short) gives 1.27 ± 0.33 ± 0.08 ps. The lifetime and branching ratio measurements provide two essentially independent methods of estimating the relative decay width difference ΔΓ/Γ in the B(s)/0-B̄(s)/0 system, corresponding to an average value ΔΓ/Γ = (25-14/+21)%. (C) 2000 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)286-299
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 3 Aug 2000


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