First observation of the $\Lambda_b^0 \to \Lambda_c^+ D_s^- K^+ K^-$ decay and search for pentaquarks in the $\Lambda_c^+ D_s^-$ system
Year: 2025
Type: article
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 Pcc¯s(4338)0 and Pcc¯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.
DOI: 10.5167/uzh-282995
Authors: Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., Adeva, B., Adinolfi, M., Adlarson, P., Agapopoulou, C., Aidala, C. A., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Aleksiejunas, R., Alessio, F., Aliouche, Z., Alvarez Cartelle, P., Amalric, R., Amato, S., Amey, J. L., Amhis, Y., An, L., Anderlini, L., Andersson, M., Andreola, P., Andreotti, M., LHCb Collaboration, et al
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7124675611
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