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Title: Observation of the Omega(-)(b) baryon and measurement of the properties of the Xi(-)(b) and Omega(-)(b) baryons
Authors: CDF Collaboration, Cabrera, Susana, Cuenca Almenar, Cristóbal, Álvarez González, B., Casal, Bruno, Cuevas, Javier, Gómez, G., Rodrigo, Teresa, Ruiz, Alberto, Scodellaro, Luca, Vila, Iván, Vilar, Rocío, Aaltonen, T.
Issue Date: 6-Sep-2009
Publisher: American Physical Society
Abstract: We report the observation of the bottom, doubly-strange baryon Omega(-)(b) through the decay chain Omega(-)(b)-> j/psi Omega(-), where J/psi ->mu(+)mu(-), Omega(-)->Lambda K-, and Lambda -> p pi(-), using 4.2 fb(-1) of data from p (p) over bar collisions at root s = 1.96 TeV, and recorded with the Collider Detector at Fermilab. A signal is observed whose The Omega(-)(b) mass is measured to be 6054.4 +/- 6.8(stat) +/- 0.9(syst) MeV/c(2). The lifetime of the Omega(-)(b) baryon is measured to be 1.13(-0.40)(+0.53)(stat) +/- 0.02(syst) ps. In addition, for the Xi(-)(b) baryon we measure a mass of 5790.9 +/- 2.6(stat) +/- 0.8(syst) MeV/c(2) and a lifetime of 1.56(-0.25)(+0.27)(stat) +/- 0.02(syst) ps. Under the assumption that the Xi(-)(b) and Omega(-)(b) are produced with similar kinematic distributions to the Lambda(0)(b) baryon, we find sigma(Xi(-)(b))B(Xi(-)(b)-> J/psi Xi(-)/sigma(Lambda(0)(b))B(Lambda(0)(b)-> J/psi Lambda) = 0.167(-0.025)(+0.037)(stat) +/- 0.012(syst) and sigma(Omega(-)(b))B(Omega(-)(b)-> J/psi Omega(-)/sigma(Lambda(0)(b))B(Lambda(0)(b)-> J/psi Lambda) = 0.045(-0.012)(+0.017)(stat) +/- 0.004(syst) for baryons produced with transverse momentum in the range of 6-20 GeV/c.
Publisher version (URL): http://dx.doi.org/ 10.1103/PhysRevD.80.072003
URI: http://hdl.handle.net/10261/22285
ISSN: 1550-7998
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Citation: Physical Review - Section D - Particles and Fields 80 (7): 072003 (2009)
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