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Observation of the heavy baryons Σ(b) and Σ(b)

AuthorsAaltonen, 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
KeywordsBottom baryons
Hadronic decays of baryons
Potential Models
High Energy Physics
Issue Date12-Nov-2007
PublisherAmerican Physical Society
CitationPhysical Review Letters 99(20): 202001 (2007)
AbstractWe 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).
Description7 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
Appears in Collections:(IFCA) Artículos
(IFIC) Artículos
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