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  • Measurement of the \Lambda_b^0, \Xi_b^- and \Omega_b^- baryon masses
    collaboration, LHCb; Alves, A A; Amato, S; Archilli, F; Artamonov, A; Back, J J; Bediaga, I; M van Beuzekom; Blanc, F; Bocci, V; Brook, N H; Cardini, A; Chiapolini, N; X Cid Vidal; Couturier, B; De Bonis, I; De Cian, M; De Paula, L; Deckenhoff, M; Dickens, J; Dijkstra, H; Dogaru, M; Dupertuis, F; Easo, S; Egede, U; Eidelman, S; Eitschberger, U; I El Rifai; Elsasser, Ch; Färber, C; Ferguson, D; Fontanelli, F; Gandelman, M; Garofoli, J; Garrido, L; Gligorov, V V; Gomes, A; Hadjivasiliou, C; Haefeli, G; Hulsbergen, W; Kreplin, K; Krocker, G; Lanciotti, E; J -P Lees; Leflat, A; Lopez-March, N; Luisier, J; Luo, H; Martellotti, G; D Martinez Santos; Matteuzzi, C; Maurice, E; McCarthy, J; Meadows, B; Meier, F; Müller, K; Muryn, B; Nasteva, I; Neufeld, N; Nguyen, A D; Nguyen, T D; Nicol, M; Nikodem, T; Orlandea, M; Owen, P; Pal, B K; Palutan, M; A Pazos Alvarez; Pellegrino, A; E Perez Trigo; Pietrzyk, B; Pinci, D; Pugatch, V; Qian, W; Sail, P; Saitta, B; Sarti, A; Semennikov, A; Shatalov, P; Shevchenko, O; Shires, A; R Silva Coutinho; Skwarnicki, T; Soomro, F; Stagni, F; Storaci, B; Szczekowski, M; Szumlak, T; Torr, N; Tran, M T; Tsopelas, P; Ukleja, A; Vecchi, S; Vieira, D; Wallace, R; Websdale, D; Wilson, F F; S Wu; Yuan, X; Zangoli, M

    arXiv.org, 02/2013
    Paper, Journal Article

    Bottom baryons decaying to a J/\psi\ meson and a hyperon are reconstructed using 1.0 fb^{-1} of data collected in 2011 with the LHCb detector. Significant \Lambda_b^0 \rightarrow J/\psi \Lambda, \Xi_b^-\rightarrow J/\psi \Xi^- and \Omega_b^- \rightarrow J/\psi \Omega^- signals are observed and the corresponding masses are measured to be M(\Lambda_b^0) = 5619.53 \pm 0.13 (stat) \pm 0.45 (syst) MeV/c^2, M(\Xi_b^-) = 5795.8 \pm 0.9 (stat) \pm 0.4 (syst) MeV/c^2, M(\Omega_b^-) = 6046.0 \pm 2.2 (stat) \pm 0.5 (syst) MeV/c^2, while the differences with respect to the \Lambda_b^0 mass are M(\Xi_b^-)-M(\Lambda_b^0) = 176.2 \pm 0.9 (stat) \pm 0.1 (syst) MeV/c^2, M(\Omega_b^-)-M(\Lambda_b^0) = 426.4 \pm 2.2 (stat) \pm 0.4 (syst) MeV/c^2. These are the most precise mass measurements of the \Lambda_b^0, \Xi_b^- and \Omega_b^- baryons to date. Averaging the above \Lambda_b^0 mass measurement with that published by LHCb using 35 pb^{-1} of data collected in 2010 yields M(\Lambda_b^0) = 5619.44 \pm 0.13 (stat) \pm 0.38 (syst) MeV/c^2.

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