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  • Measurement of the effective B_s^0 -> J/{\psi} K_S^0 lifetime
    collaboration, LHCb; Amato, S; Archilli, F; Artamonov, A; Back, J J; Belyaev, I; Blanc, F; Bondar, A; Bressieux, J; Buytaert, J; Cardini, A; Cliff, H V; Corti, G; De Bonis, I; De Bruyn, K; De Silva, W; Deckenhoff, M; Dijkstra, H; Easo, S; Egede, U; Eidelman, S; Eitschberger, U; I El Rifai; Elsasser, Ch; Ferguson, D; Fitzpatrick, C; Forty, R; Francisco, O; Frei, C; A Gallas Torreira; J Garra Tico; Gaspar, C; Gligorov, V V; Göbel, C; Gomes, A; Hall, S; Hoballah, M; Hunt, P; Hutchcroft, D; Hynds, D; Joram, C; Kandybei, S; Keune, A; Kochebina, O; Kozlinskiy, A; Krokovny, P; Kvaratskheliya, T; Lanfranchi, G; Latham, T; Longstaff, I; Machefert, F; Machikhiliyan, I V; Maciuc, F; Mancinelli, G; Massafferri, A; Mazurov, A; J Molina Rodriguez; Mous, I; Needham, M; Oblakowska-Mucha, A; Obraztsov, V; Oggero, S; Panman, J; Parkinson, C J; Passaleva, G; Pavel-Nicorescu, C; Perret, P; Pessina, G; Phan, A; M Plo Casasus; Redford, S; Reid, M M; dos Reis, A C; Ricciardi, S; Rinnert, K; Ruiz, H; Guimaraes, V Salustino; Sannino, M; Sarti, A; Shears, T; Shevchenko, V; R Silva Coutinho; Souza, D; Spaan, B; Sparkes, A; Spradlin, P; Straumann, U; T'Jampens, S; Teubert, F; Tisserand, V; Topp-Joergensen, S; Tourneur, S; Vecchi, S; Vieira, D; Ward, D R; Wilson, F F; Young, R; Yuan, X; Zangoli, M; Zhang, Y

    arXiv.org, 05/2013
    Paper, Journal Article

    This paper reports the first measurement of the effective B_s^0 -> J/{\psi} K_S^0 lifetime and an updated measurement of its time-integrated branching fraction. Both measurements are performed with a data sample, corresponding to an integrated luminosity of 1.0 fb^{-1} of pp collisions, recorded by the LHCb experiment in 2011 at a centre-of-mass energy of 7 TeV. The results are: tau_J/{\psi}K_S^0 = 1.75 +/- 0.12 (stat) +/- 0.07 (syst) and BR(B_s^0 -> J/{\psi} K_S^0) = (1.97 +/- 0.23) X 10^{-5}. For the latter measurement, the uncertainty includes both statistical and systematic sources.

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