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Título : Observation of the Omega(-)(b) baryon and measurement of the properties of the Xi(-)(b) and Omega(-)(b) baryons
Autor : 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.
Fecha de publicación : 6-Sep-2009
Editor: American Physical Society
Citación : Physical Review - Section D - Particles and Fields 80 (7): 072003 (2009)
Resumen: 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.
Versión del editor: 10.1103/PhysRevD.80.072003
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.80.072003
Citación : Physical Review - Section D - Particles and Fields 80 (7): 072003 (2009)
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