Measurement of the effective B_s^0 -> J/{\psi} K_S^0 lifetime

• Published in: arXiv.org 2013-05
• Main Authors: 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, 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, Marks, J, 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
• Format: Article
• Language: English
• Subjects: Large Hadron Collider; Luminosity
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1304.4500

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.