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Title: Observation of the Λb0→χc1 (3872) pK− decay
Author: Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Hadrons
Col·lisions (Física)
Collisions (Physics)
Issue Date: 3-Sep-2019
Publisher: Springer Verlag
Abstract: Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0 b → χc1(3872)pK− with χc1(3872) → J/ψ π+π − is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872)Λ(1520). The branching fraction with respect to that of the Λ0 b → ψ(2S)pK− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+π − final state, is measured to be: B(Λ0b → χc1(3872)pK−)B(Λ0b → ψ(2S)pK−)×B(χc1(3872) → J/ψ π+π−)B(ψ(2S) → J/ψ π+π−)= (5.4 ± 1.1 ± 0.2) × 10−2, where the first uncertainty is statistical and the second is systematic.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2019, p. 28
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ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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