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Title: | Evidence for the Strangeness-Changing Weak Decay Ξ−b→Λ0bπ− |
Author: | Badalov, Alexey Calvo Gómez, Míriam Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 11-Dec-2015 |
Publisher: | American Physical Society |
Abstract: | Using a p p 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 → Λ 0 b π − . 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 f Ξ − b f Λ 0 b B ( Ξ − b → Λ 0 b π − ) = ( 5.7 ± 1. 8 + 0.8 − 0.9 ) × 10 − 4 , where f Ξ − b and f Λ 0 b are the b → Ξ − b and b → Λ 0 b fragmentation fractions, and B ( Ξ − b → Λ 0 b π − ) is the branching fraction. Assuming f Ξ − b / f Λ 0 b is bounded between 0.1 and 0.3, the branching fraction B ( Ξ − b → Λ 0 b π − ) would lie in the range from ( 0.57 ± 0.21 ) % to ( 0.19 ± 0.07 ) % . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.115.241801 |
It is part of: | Physical Review Letters, 2015, vol. 115, num. 24, p. 241801 |
URI: | http://hdl.handle.net/2445/132910 |
Related resource: | https://doi.org/10.1103/PhysRevLett.115.241801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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