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Title: | Searches for Λ0b and Ξ0b decays to K0Spπ− and K0SpK− final states with first observation of the Λ0b→K0Spπ− decay |
Author: | Camboni, Alessandro Comerma-Montells, A. Garrido Beltrán, Lluís Graciani Díaz, Ricardo Graugés Pous, Eugeni Picatoste Olloqui, E. Potterat, C. Rives Molina, V. Ruiz, Hugo LHCb Collaboration |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | Apr-2014 |
Publisher: | Springer Verlag |
Abstract: | A search for previously unobserved decays of beauty baryons to the final states K0 S pπ− and K0 S pK− is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions. The Λ 0 b → K0pπ− decay is observed with a significance of 8.6 σ, with branching fraction B(Λ 0 b → K0 pπ−) = (1.26 ± 0.19 ± 0.09 ± 0.34 ± 0.05) × 10−5 , where the uncertainties are statistical, systematic, from the ratio of fragmentation fractions fΛ0 b /fd, and from the branching fraction of the B0→ K0π +π − normalisation channel, respectively. A first measurement is made of the CP asymmetry, giving ACP (Λ 0 b → K0 pπ−) = 0.22 ± 0.13 (stat) ± 0.03 (syst). No significant signals are seen for Λ 0 b → K0 S pK− decays, Ξ0 b decays to both the K0 S pπ− and K0 S pK− final states, and the Λ 0 b → D− s (→ K0 SK−)p decay, and upper limits on their branching fractions are reported. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP04(2014)087 |
It is part of: | Journal of High Energy Physics, 2014, vol. 4, num. 087, p. 1-27 |
URI: | http://hdl.handle.net/2445/185688 |
Related resource: | https://doi.org/10.1007/JHEP04(2014)087 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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