Observation of the Ξb0 Baryon

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URI: http://hdl.handle.net/10902/2152
ISSN: 0031-9007
ISSN: 1079-7114
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Autoría
Aaltonen, Timo Antero; Álvarez González, Bárbara; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, GervasioAutoridad Unican; Palencia Cortezón, José Enrique; Rodrigo Anoro, TeresaAutoridad Unican; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; Vila Álvarez, Iván Autoridad Unican; Vilar Cortabitarte, RocíoAutoridad Unican; Vizán García, Jesús ManuelAutoridad Unican
Fecha
2011-08-31
Derechos
© 2011 American Physical Society
Publicado en
Physical Review Letters, 2011, 107(10), 102001
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American Physical Society
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Resumen/Abstract
The observation of the bottom, strange baryon Ξb0 through the decay chain Ξb0→Ξc+π-, where Ξc+→Ξ-π+π+, Ξ-→Λπ-, and Λ→pπ-, is reported by using data corresponding to an integrated luminosity of 4.2  fb-1 from pp̅ collisions at √s=1.96  TeV recorded with the Collider Detector at Fermilab. A signal of 25.3-5.4+5.6 candidates is observed whose probability of arising from a background fluctuation is 3.6×10-12, corresponding to 6.8 Gaussian standard deviations. The Ξb0 mass is measured to be 5787.8±5.0(stat)±1.3(syst)  MeV/c2. In addition, the Ξb- baryon is observed through the process Ξb-→Ξc0π-, where Ξc0→Ξ-π+, Ξ-→Λπ-, and Λ→pπ-.
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