The Cabibbo-suppressed decay Λb0→ 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 Λb0→ χc2pπ− decay is also found. Using the Λb0→ χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to beB(Λb0→χc1pπ−)B(Λb0→χc1pK−)=(6.59±1.01±0.22)×10−2,B(Λb0→χc2pπ−)B(Λb0→χc1pπ−)=0.95±0.30±0.04±0.04,B(Λb0→χc2pK−)B(Λb0→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. [Figure not available: see fulltext.]

Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of the decay Λb0 → χc1pπ−. JOURNAL OF HIGH ENERGY PHYSICS, 2021(5) [10.1007/JHEP05(2021)095].

Observation of the decay Λb0 → χc1pπ−

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Shields E. B.;
2021

Abstract

The Cabibbo-suppressed decay Λb0→ 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 Λb0→ χc2pπ− decay is also found. Using the Λb0→ χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to beB(Λb0→χc1pπ−)B(Λb0→χc1pK−)=(6.59±1.01±0.22)×10−2,B(Λb0→χc2pπ−)B(Λb0→χc1pπ−)=0.95±0.30±0.04±0.04,B(Λb0→χc2pK−)B(Λb0→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. [Figure not available: see fulltext.]
Articolo in rivista - Articolo scientifico
B physics; Branching fraction; Hadron-Hadron scattering (experiments); QCD; Quarkonium;
English
2021
2021
5
95
open
Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of the decay Λb0 → χc1pπ−. JOURNAL OF HIGH ENERGY PHYSICS, 2021(5) [10.1007/JHEP05(2021)095].
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