The Λb0 → Λc+ Ds− 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 Λb0 → Λc+ Ds− 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 Λc+ Ds− system. No evidence is found, and upper limits on the production ratio of P_{c anti-c s}(4338)0 and P_{c anti-c s}(4459)0 pentaquarks relative to the Λc+ Ds− final state are set at the 95% confidence level as 0.12 and 0.20, respectively.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (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), 1-14 [10.1103/b28d-z2xc].

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

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

The Λb0 → Λc+ Ds− 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 Λb0 → Λc+ Ds− 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 Λc+ Ds− system. No evidence is found, and upper limits on the production ratio of P_{c anti-c s}(4338)0 and P_{c anti-c s}(4459)0 pentaquarks relative to the Λc+ Ds− final state are set at the 95% confidence level as 0.12 and 0.20, respectively.
2025
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (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), 1-14 [10.1103/b28d-z2xc].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1035731
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