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Open Access item Observation of the heavy baryons Σ(b) and Σ(b)

Authors:Aaltonen, T.
Cabrera, Susana
Casal, Bruno
Chuang, S. H.
Rodrigo, Teresa
Ruiz Jimeno, Alberto
Cuenca Almenar, Cristóbal
Gómez, G.
Palencia, Enrique
Cuevas, Javier
Piedra, Jonatan
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Keywords:Bottom baryons, Hadronic decays of baryons, Potential Models, Masses, Quark, Spectroscopy, High Energy Physics
Issue Date:12-Nov-2007
Publisher:American Physical Society
Citation:Physical Review Letters 99(20): 202001 (2007)
Abstract:We report an observation of new bottom baryons produced in p(p)over-bar collisions at the Tevatron. Using 1.1 fb(-1) of data collected by the CDF II detector, we observe four Λ(0)(b)π(±) resonances in the fully reconstructed decay mode Λ(0)(b)->Λ(+)(c)π(-), where Λ(+)(c)-> pK(-)π(+). We interpret these states as the Σ((*)±)(b) baryons and measure the following masses: m(Σb)(+)=5807.8(-2.2)(+2.0)(stat.) ± 1.7(syst.) MeV/c^(2), m(Σb)(-)=5815.2 ± 1.0(stat.)± 1.7(syst.) MeV/c^(2), and m(Σ(*)(b))-m(Σ(b))=21.2(-1.9)(+2.0)(stat.)(-0.3)(+0.4)(syst.) MeV/c^(2).
Description:7 páginas, 2 figuras, 2 tablas.-- PACS nrs.: 14.20.Mr, 13.30.Eg.-- CDF Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevLett.99.202001
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