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  • Effective lifetime measurements in the \(B_{s}^{0} \rightarrow K^{+}K^{-}\), \(B^{0} \rightarrow K^{+}\pi^{-}\) and \(B_{s}^{0} \rightarrow \pi^{+}K^{-}\) decays
    Adeva, B; Amhis, Y; Archilli, F; Artamonov, A; Badalov, A; Balagura, V; Bifani, S; Bird, T; Bocci, V; van den Brand, J; M Calvo Gomez; Carson, L; Charpentier, Ph; Closier, J; Cook, A; Currie, R; Davis, A; Decamp, D; Déléage, N; A Dosil Suárez; Dossett, D; Dovbnya, A; V Fernandez Albor; F Ferreira Rodrigues; Ferro-Luzzi, M; Fontana, M; Garofoli, J; Garrido, L; R Graciani Diaz; Griffith, P; Grillo, L; Gui, B; Han, X; Hartmann, T; J He; Hennessy, K; Henrard, P; Hill, D; Idzik, M; Kelsey, M; Ketel, T; Kochebina, O; Kozlinskiy, A; Kreps, M; Lambert, R W; J van Leerdam; Lefrançois, J; Leo, S; Mapelli, A; Marks, J; Matev, R; M -N Minard; Moggi, N; J Molina Rodriguez; Morawski, P; Müller, K; Muster, B; Nasteva, I; Neubert, S; Niess, V; Novoselov, A; Orlandea, M; Oyanguren, A; Papanestis, A; Pearce, A; M Pepe Altarelli; Perret, P; Pescatore, L; Pistone, A; Poluektov, A; Potterat, C; Pritchard, A; Pugatch, V; Qian, W; Robbe, P; P Ruiz Valls; Sagidova, N; Guimaraes, V Salustino; Schiller, M; Serra, N; Sirendi, M; Soomro, F; Sparkes, A; Spradlin, P; Subbiah, V K; Swientek, S; Tolk, S; Tomassetti, L; Topp-Joergensen, S; C Vázquez Sierra; Vecchi, S; C Vo\ss; de Vries, J A; Waldi, R; Whitehead, M; Wilson, F F; Wyllie, K; Yushchenko, O; Zangoli, M; Zhokhov, A

    arXiv.org, 09/2014
    Paper

    Measurements of the effective lifetimes in the \(B_{s}^{0} \rightarrow K^{+}K^{-}\), \(B^{0} \rightarrow K^{+}\pi^{-}\) and \(B_{s}^{0} \rightarrow \pi^{+}K^{-}\) decays are presented using \(1.0~\mathrm{fb^{-1}}\) of \(pp\) collision data collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The analysis uses a data-driven approach to correct for the decay time acceptance. The measured effective lifetimes are \(\tau_{B_{s}^{0} \rightarrow K^{+}K^{-}}\) = \(1.407~\pm~0.016~\pm~0.007~\mathrm{ps}\), \(\tau_{B^{0} \rightarrow K^{+}\pi^{-}}\) = \(1.524~\pm~0.011~\pm~0.004~\mathrm{ps}\), \(\tau_{B_{s}^{0} \rightarrow \pi^{+}K^{-}}\) = \(1.60~\pm~0.06~\pm~0.01~\mathrm{ps}\). This is the most precise determination to date of the effective lifetime in the \(B_{s}^{0} \rightarrow K^{+}K^{-}\) decay and provides constraints on contributions from physics beyond the Standard Model to the \(B_{s}^{0}\) mixing phase and the width difference \(\Delta\Gamma_{s}\).

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