Observation of the Λb0→J/ψΞ-K+ Decay

European Physical Journal C 2024
Kārlis Dreimanis, Antra Gaile, Guntis Pikurs, Andris Potrebko, Markus Seidel, Viesturs Veckalns, CMS Collaboration

Using proton–proton collision data corresponding to an integrated luminosity of 140fb-1 collected by the CMS experiment at s=13TeV, the Λb0→J/ψΞ-K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λb0→ψ(2S)Λ decay, is measured to be B(Λb0→J/ψΞ-K+)/B(Λb0→ψ(2S)Λ)=[3.38±1.02±0.61±0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S)→J/ψπ+π-) and B(Ξ-→Λπ-).

DOI
10.1140/epjc/s10052-024-13114-9
Hyperlink
https://link.springer.com/article/10.1140/epjc/s10052-024-13114-9

The CMS Collaboration, Hayrapetyan, A., Dreimanis, K., Gaile, A., Pikurs, G., Potrebko, A., Seidel, M., Veckalns, V. ... [et al.] Observation of the Λb0→J/ψΞ-K+ Decay. European Physical Journal C, 2024, Vol. 84, No. 10, Article number 106. ISSN 1434-6044. e-ISSN 1434-6052. Pieejams: doi:10.1140/epjc/s10052-024-13114-9

Publication language
English (en)