First observation of the Λb0 → Λc+Ds- K+ K- decay and search for pentaquarks in the Λc+Ds- system



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1168 more authors) (2025) First observation of the Λb0 → Λc+Ds- K+ K- decay and search for pentaquarks in the Λc+Ds- system PHYSICAL REVIEW D, 112 (5). pp. 1-14. ISSN 2470-0010, 2470-0029

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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.

Item Type: Article
Uncontrolled Keywords: 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Divisions: Faculty of Humanities & Social Sciences
Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Faculty of Humanities & Social Sciences > School of the Arts
Faculty of Humanities & Social Sciences > School of the Arts > Architecture
Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User: Symplectic Admin
Date Deposited: 13 Oct 2025 08:01
Last Modified: 16 Jun 2026 07:11
DOI: 10.1103/b28d-z2xc
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/b28d-z2xc
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3194811
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