The Cabibbo-suppressed decay Λ0b → χc1pπ− is observed for the first time us- ing 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 Λ0b → χc2pπ− decay is also found. Using the Λ0b → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be BΛ0b →χc1pπ− BΛ0b →χc1pK− BΛ0b →χc2pπ− BΛ0b →χc1pπ− BΛ0b →χc2pK− BΛ0b →χc1pK− −2 =(6.59±1.01±0.22)×10 , = 0.95±0.30±0.04±0.04, = 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.
Observation of the decay Lambda b0 -> chi(c1)p pi(-)
Lusiani, A.Membro del Collaboration Group
;Morello, M. J.Membro del Collaboration Group
;Pajero, T.Membro del Collaboration Group
;
2021
Abstract
The Cabibbo-suppressed decay Λ0b → χc1pπ− is observed for the first time us- ing 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 Λ0b → χc2pπ− decay is also found. Using the Λ0b → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be BΛ0b →χc1pπ− BΛ0b →χc1pK− BΛ0b →χc2pπ− BΛ0b →χc1pπ− BΛ0b →χc2pK− BΛ0b →χc1pK− −2 =(6.59±1.01±0.22)×10 , = 0.95±0.30±0.04±0.04, = 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.File | Dimensione | Formato | |
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Aaij2021_Article_ObservationOfTheDecayΛb0Lambda.pdf
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