The decay B-→Λc+Λ¯c-K- is studied in proton-proton collisions at a center-of-mass energy of s=13 TeV using data corresponding to an integrated luminosity of 5 fb-1 collected by the LHCb experiment. In the Λc+K- system, the Ξc(2930)0 state observed at the BABAR and Belle experiments is resolved into two narrower states, Ξc(2923)0 and Ξc(2939)0, whose masses and widths are measured to be m(Ξc(2923)0)=2924.5±0.4±1.1 MeV, m(Ξc(2939)0)=2938.5±0.9±2.3 MeV, Γ(Ξc(2923)0)=4.8±0.9±1.5 MeV, Γ(Ξc(2939)0)=11.0±1.9±7.5 MeV, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λc+K- sample. Evidence of a new Ξc(2880)0 state is found with a local significance of 3.8σ, whose mass and width are measured to be 2881.8±3.1±8.5 MeV and 12.4±5.3±5.8 MeV, respectively. In addition, evidence of a new decay mode Ξc(2790)0→Λc+K- is found with a significance of 3.7σ. The relative branching fraction of B-→Λc+Λ¯c-K- with respect to the B-→D+D-K- decay is measured to be 2.36±0.11±0.22±0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Study of the B- → Λc+ Λ ¯ c- K- decay. PHYSICAL REVIEW D, 108(1) [10.1103/PhysRevD.108.012020].

Study of the B- → Λc+ Λ ¯ c- K- decay

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

The decay B-→Λc+Λ¯c-K- is studied in proton-proton collisions at a center-of-mass energy of s=13 TeV using data corresponding to an integrated luminosity of 5 fb-1 collected by the LHCb experiment. In the Λc+K- system, the Ξc(2930)0 state observed at the BABAR and Belle experiments is resolved into two narrower states, Ξc(2923)0 and Ξc(2939)0, whose masses and widths are measured to be m(Ξc(2923)0)=2924.5±0.4±1.1 MeV, m(Ξc(2939)0)=2938.5±0.9±2.3 MeV, Γ(Ξc(2923)0)=4.8±0.9±1.5 MeV, Γ(Ξc(2939)0)=11.0±1.9±7.5 MeV, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λc+K- sample. Evidence of a new Ξc(2880)0 state is found with a local significance of 3.8σ, whose mass and width are measured to be 2881.8±3.1±8.5 MeV and 12.4±5.3±5.8 MeV, respectively. In addition, evidence of a new decay mode Ξc(2790)0→Λc+K- is found with a significance of 3.7σ. The relative branching fraction of B-→Λc+Λ¯c-K- with respect to the B-→D+D-K- decay is measured to be 2.36±0.11±0.22±0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.
Articolo in rivista - Articolo scientifico
B Physics; LHCb; Hadron-Hadron scattering (experiments); Heavy quark production;
English
2023
108
1
012020
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Study of the B- → Λc+ Λ ¯ c- K- decay. PHYSICAL REVIEW D, 108(1) [10.1103/PhysRevD.108.012020].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/455442
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