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Open Access item Observation and Mass Measurement of the Baryon Ξb-

Authors:Aaltonen, T.
Ruiz Jimeno, Alberto
Chuang, S. H.
Cuenca Almenar, Cristóbal
Gómez, G.
Palencia, Enrique
Cuevas, Javier
Rodrigo, Teresa
Piedra, Jonatan
Cabrera, Susana
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Casal, Bruno
Keywords:Bottom baryons, Hadronic decays of baryons, Hadronic Collisions, Quark Production, Cross-section, High Energy Physics
Issue Date:3-Aug-2007
Publisher:American Physical Society
Citation:Physical Review Letters 99(5): 052002 (2007)
Abstract:We report the observation and measurement of the mass of the bottom, strange baryon Ξ(-)(b) through the decay chain Ξ(-)(b)-->J/Ψ Ξ(-), where J/Ψ --> μ(+)μ(-), Ξ(-) --> Λπ(-), and Λ --> pπ(-). A signal is observed whose probability of arising from a background fluctuation is 6.6x10(-15), or 7.7 Gaussian standard deviations. The Ξ(-)(b) mass is measured to be 5792.9 ± 2.5(stat) ± 1.7(syst) MeV/c^(2).
Description:7 páginas, 2 figuras, 1 tabla.-- PACS nrs.: 14.20.Mr, 13.30.Eg, 13.60.Rj.-- CDF Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevLett.99.052002
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