NUK - logo
E-viri
Celotno besedilo
Odprti dostop
  • Precision measurement of the Lambda_b baryon lifetime
    collaboration, LHCb; Alves, A A; Archilli, F; Artamonov, A; Balagura, V; Bifani, S; Bocci, V; Bondar, A; Bozzi, C; Brook, N H; Casse, G; Cattaneo, M; Chen, P; Chrzaszcz, M; Ciba, K; Coca, C; Cogan, J; Collins, P; Cook, A; Craik, D C; Derkach, D; Deschamps, O; Dettori, F; Dogaru, M; Dziurda, A; Dzyuba, A; Eitschberger, U; Farinelli, C; Farry, S; Ferguson, D; Fitzpatrick, C; Forty, R; Francisco, O; Frei, C; A Gallas Torreira; J Garra Tico; Gaspar, C; Göbel, C; Gorbounov, P; Graziani, G; Gushchin, E; Haen, C; Hansmann-Menzemer, S; Harrison, J; Heijne, V; Hombach, C; John, M; Jost, B; Korolev, M; Kudryavtsev, V; La Thi, V N; Lambert, D; Langenbruch, C; Liles, M; Lopez-March, N; Luo, H; A Martín Sánchez; Martinelli, M; D Martinez Santos; D Martins Tostes; Maurice, E; McCarthy, J; Meadows, B; Muheim, F; Muresan, R; Nakada, T; Oblakowska-Mucha, A; Oggero, S; Patel, G D; Patrick, G N; Perrin-Terrin, M; Phan, A; Polci, F; Prisciandaro, J; Redford, S; Ricciardi, S; Sail, P; C Santamarina Rios; Satriano, C; Schlupp, M; Semennikov, A; Shapoval, I; Shatalov, P; Shears, T; Shires, A; R Silva Coutinho; Steinkamp, O; Tournefier, E; Tsaregorodtsev, A; M Ubeda Garcia; Urner, D; Veltri, M; Vollhardt, A; Vorobyev, A; Wang, J; Ward, D R; Wimberley, J; Wright, S; Young, R; Zvyagin, A

    arXiv.org, 07/2013
    Paper, Journal Article

    The ratio of the \Lambda b baryon lifetime to that of the B0 meson is measured using 1.0/fb of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The \Lambda b baryon is observed for the first time in the decay mode \Lambda b -> J/\psi pK-, while the B0 meson decay used is the well known B0 -> J/\psi pi+K- mode, where the pi+ K- mass is consistent with that of the K*0(892) meson. The ratio of lifetimes is measured to be 0.976 +/- 0.012 +/- 0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B0 meson lifetime, the \Lambda b lifetime is found to be 1.482 +/- 0.018 +/- 0.012 ps. In both cases the first uncertainty is statistical and the second systematic.

Vnos na polico