Título:
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Evidence for the Strangeness-Changing Weak Decay Ξ−b→Λ0bπ−
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Autor/a:
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Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN
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Otros autores:
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Universitat Ramon Llull. La Salle; CERN |
Abstract:
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Using a pp collision data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξ−b→Λ0bπ−. No b hadron decay of this type has been seen before. A signal for this decay, corresponding to a significance of 3.2 standard deviations, is reported. The relative rate is measured to be fΞ−bfΛ0bB(Ξ−b→Λ0bπ−)=(5.7±1.8+0.8−0.9)×10−4,where fΞ−b and fΛ0b are the b→Ξ−b and b→Λ0b fragmentation fractions, and B(Ξ−b→Λ0bπ−) is the branching fraction. Assuming fΞ−b/fΛ0b is bounded between 0.1 and 0.3, the branching fraction B(Ξ−b→Λ0bπ−) would lie in the range from (0.57±0.21)% to (0.19±0.07)%. |
Fecha de creación:
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11-12-2015 |
Materias (CDU):
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53 - Física |
Materia(s):
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Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Protons Col·lisions (Física nuclear) |
Derechos:
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L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/
© CERN |
Páginas:
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10 p. |
Tipo de documento:
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Artículo Artículo - Versión publicada |
DOI:
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https://doi.org/10.1103/PhysRevLett.115.241801
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Editor:
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American Physical Society
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Publish at:
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Physical Review Letters, 2015, Vol. 115, No. 24 (Desembre)
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Compartir:
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