The Λ0 b → Λþc D−s KþK− 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 → Λþc 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 Λþc D−s system. No evidence is found, and upper limits on the production ratio of Pc¯csð4338Þ0 and Pc¯csð4459Þ0 pentaquarks relative to the Λþc D−s final state are set at the 95% confidence level as 0.12 and 0.20, respectively.

First observation of the Lmabda0b -> Lambda+c D-s K+K- decay and search for pentaquarks in the Λ+c D-s system

Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
Xu A.
Membro del Collaboration Group
;
2025

Abstract

The Λ0 b → Λþc D−s KþK− 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 → Λþc 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 Λþc D−s system. No evidence is found, and upper limits on the production ratio of Pc¯csð4338Þ0 and Pc¯csð4459Þ0 pentaquarks relative to the Λþc D−s final state are set at the 95% confidence level as 0.12 and 0.20, respectively.
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Branching Fraction; Quantum chromodynamics; Strong interaction; Exotic baryons
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/164863
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