Abazov, V. M. and Abbott, B. and Abolins, M. and Acharya, B. S. and Adams, M. and Adams, T. and Aguilo, E. and Ahsan, M. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Alverson, G. and Alves, G. A. and Anastasoaie, M. and Ancu, L. S. and Andeen, T. and Andrieu, B. and Anzelc, M. S. and Aoki, M. and Arnoud, Y. and Arov, M. and Arthaud, M. and Askew, A. and Asman, B. and Assis Jesus, A. C. S. and Atramentov, O. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Banerjee, P. and Banerjee, S. and Barberis, E. and Barfuss, A. -F. and Bargassa, P. and Baringer, P. and Barreto, J. and Bartlett, J. F. and Bassler, U. and Bauer, D. and Beri, S. B. and Bertram, I. and Biscarat, C. and Borissov, G. and Fox, H. and Johnson, M. and Love, P. and Ratoff, P. N. and Sopczak, A. (2008) Observation of the doubly strange b baryon Omega(-)(b). Physical review letters, 101 (23): 232002. ISSN 0031-9007
Abstract
We report the observation of the doubly strange b baryon Omega(-)(b) in the decay channel Omega(-)(b) -> J/psi Omega(-), with J/psi -> mu(+)mu(-) and Omega(-) -> Lambda K- -> (p pi(-))K-, in p (p) over bar collisions at root s = 1.96 TeV. Using approximately 1.3 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8 +/- 4.9(stat) +/- 0.8(syst) Omega(-)(b) signal events at a mass of 6.165 +/- 0.010(stat) +/- 0.013(syst) GeV. The significance of the observed signal is 5.4 sigma, corresponding to a probability of 6.7 x 10(-8) of it arising from a background fluctuation.