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  • Observation of the decay $B_c^+ \to \psi(2S)\pi
    Amato, S; Archilli, F; Artamonov, A; Belyaev, I; Bifani, S; Bocci, V; Bondar, A; Bozzi, C; Cardini, A; Akiba, K. Carvalho; Chiapolini, N; Clarke, P. E. L; Cliff, H. V; Couturier, B; De Bonis, I; De Cian, M; De Silva, W; Deckenhoff, M; Eisenhardt, S; Falabella, A; Albor, V. Fernandez; Filippov, S; Fontana, M; Frank, M; Furfaro, E; Torreira, A. Gallas; Gandini, P; Gibson, V; Golutvin, A; Gordon, H; Guz, Yu; Gys, T; Hampson, T; Hartmann, T; Hopchev, P; Idzik, M; Jans, E; John, M; Jones, C. R; Korolev, M; Kravchuk, L; Kruse, F; La Thi, V. N; Lacarrere, D; Lafferty, G; Lees, J. -P; Li, Y; Liles, M; Asamar, E. Lopez; Lopez-March, N; Lucchesi, D; Luisier, J; Luo, H; Machikhiliyan, I. V; Müller, K; Muryn, B; Nasteva, I; Neufeld, N; Nicol, M; Nikodem, T; Novoselov, A; Okhrimenko, O; Owen, P; Palutan, M; Patel, M; Pellegrino, A; Altarelli, M. Pepe; Trigo, E. Perez; Pietrzyk, B; Pinci, D; Polok, G; Poluektov, A; Popov, D; Qian, W; Reid, M. M; Molina, V. Rives; Saitta, B; Sarti, A; Semennikov, A; Shatalov, P; Shevchenko, O; Shires, A; Skwarnicki, T; Soomro, F; Stagni, F; Szczekowski, M; Szumlak, T; T'Jampens, S; Teodorescu, E; Torr, N; Tourneur, S; Vecchi, S; Vieira, D; Voß, C; Wallace, R; Websdale, D; Wotton, S. A; Yuan, X; Zangoli, M; Zhang, Y

    03/2013
    Journal Article

    Phys. Rev. D 87, 071103(R) (2013) The decay $B_c^+ \to \psi(2S)\pi^+$ with $\psi(2S) \to \mu^+\mu^-$ is observed with a significance of $5.2\,\sigma$ using $pp$ collision data corresponding to an integrated luminosity of $1.0\,\invfb$ collected by the LHCb experiment. The branching fraction of $B_c^+ \to \psi(2S)\pi^+$ decays relative to that of the $B_c^+ \to J/\psi\pi^+$ mode is measured to be \begin{equation*} \frac{\mathcal{B}(B_c^+ \to \psi(2S)\pi^+)}{\mathcal{B}(B_c^+ \to J/\psi\pi^+)} = 0.250 \pm 0.068 \,\text{stat} \pm 0.014 \,\text{\syst} \pm 0.006 \,(\mathcal{B}). \end{equation*} The last term is the uncertainty on the ratio $\mathcal{B}(\psi(2S) \to \mu^+\mu^-)/\mathcal{B}(J/\psi \to \mu^+\mu^-)$.

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