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Title: | Observation of the suppressed decay Λ b 0 → pπ - μ + μ - |
Author: | Camboni, Alessandro Coquereau, S. Garrido Beltrán, Lluís Gascón Fora, David Graciani Diaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, E. Rives Molina, V. Alfonso Albero, Alejandro Calvo Gomez, M. Gironella Gironell, P. Vazquez Gomez, R. 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-2017 |
Publisher: | Springer Verlag |
Abstract: | The suppressed decay Λ b 0 → pπ - μ + μ -, excluding the J/ ψ and ψ(2 S) → μ + μ - resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb-1 collected with the LHCb experiment. The Λ b 0 → pπ - μ + μ - branching fraction is measured relative to the Λ b 0 → J/ ψ(→ μ + μ -) pπ - branching fraction giving B({Λ}_b^0\to p{π}^{-/μ+{μ}-)}{B({Λ}_b^0\to J/ψ (\to {μ}+{μ}-)p{π}-)}=0.044± 0.012± 0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP04(2017)029 |
It is part of: | Journal of High Energy Physics, 2017, vol. 2017, num. 29, p. 1-16 |
URI: | http://hdl.handle.net/2445/186405 |
Related resource: | https://doi.org/10.1007/JHEP04(2017)029 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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