Searches for Λ0b and Ξ0b decays to K0spπ and K0spK- final states with first observation of the Λ0b → K0s- decay

The LHCb Collaboration

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A search for previously unobserved decays of beauty baryons to the final states K0spπ- and K0 spK- is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb- of pp collisions. The Λ0b → ̄K pπ- decay is observed with a significance of 8.6σ, with branching fraction (Equation Presented), where the uncertainties are statistical, systematic, from the ratio of fragmentation fractions f Λ0b/fd, and from the branching fraction of the B0 → K0π+π - normalisation channel, respectively. A first measurement is made of the CP asymmetry, giving (Equation Presented). No significant signals are seen for Λ0b → K0spK - decays, Ξ0b decays to both the K 0spπ- and K0spK - final states, and the Λ0b → D-s(→ K0sK-)p decay, and upper limits on their branching fractions are reported.
Original languageEnglish
Article number087
Number of pages24
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 2014
Externally publishedYes

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