# metadata.dc.description.abstract[].value
The Cabibbo-suppressed decay Λ 0 b → χc1pπ − is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1 , collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λ 0 b → χc2pπ − decay is also found. Using the Λ 0 b → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be B Λ 0 b → χc1pπ −  B Λ0 b → χc1pK−  = (6.59 ± 1.01 ± 0.22) × 10−2 , B Λ 0 b → χc2pπ −  B Λ0 b → χc1pπ−  = 0.95 ± 0.30 ± 0.04 ± 0.04 , B Λ 0 b → χc2pK−  B Λ0 b → χc1pK−  = 1.06 ± 0.05 ± 0.04 ± 0.04 , where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2 → J/ψγ decays. Keywords: B physics, Branching fraction, Hadron-Hadron scattering (experiments), QCD, Quar

# metadata.dc.relation.ispartof[].value
Journal of High Energy Physics, 2021, vol. 2021, p. 1-21

# metadata.dc.rights[].value
cc-by (c) Alfonso Albero, Alejandro et al., 2021

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.subject.other[].value
Large Hadron Collider (France and Switzerland)