The Λ0b → Λ+c D−s K+K− decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb−1. The ratio of branching fraction to that of Λ0 b → Λ+c D−s decays is measured as 0.0141+-0.0019+-0.0012, where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the Λ+c D−s system. No evidence is found, and upper limits on the production ratio of Pc¯cs(4338)0 and Pc¯cs(4459)0 pentaquarks relative to the Λ+c D−s final state are set at the 95% confidence level as 0.12 and 0.20, respectively.

Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). First observation of the Λ0b → Λ+c D−s K+K− decay and search for pentaquarks in the Λ+c D−s system. PHYSICAL REVIEW D, 112(5), 1-14 [10.1103/b28d-z2xc].

First observation of the Λ0b → Λ+c D−s K+K− decay and search for pentaquarks in the Λ+c D−s system

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Pardinas J. G.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2025

Abstract

The Λ0b → Λ+c D−s K+K− decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb−1. The ratio of branching fraction to that of Λ0 b → Λ+c D−s decays is measured as 0.0141+-0.0019+-0.0012, where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the Λ+c D−s system. No evidence is found, and upper limits on the production ratio of Pc¯cs(4338)0 and Pc¯cs(4459)0 pentaquarks relative to the Λ+c D−s final state are set at the 95% confidence level as 0.12 and 0.20, respectively.
Articolo in rivista - Review Essay
Flavour Physics; Pentaquarks
English
29-set-2025
2025
112
5
1
14
052013
none
Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). First observation of the Λ0b → Λ+c D−s K+K− decay and search for pentaquarks in the Λ+c D−s system. PHYSICAL REVIEW D, 112(5), 1-14 [10.1103/b28d-z2xc].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/593144
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