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Searches for Λ0bΛb0 and Ξ0bΞb0 decays to K0Spπ−KS0pπ− and K0SpK−KS0pK−final states with first observation of the Λ0b→K0Spπ−Λb0→KS0pπ−decay

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Original languageEnglish
Article numberAaij:2014lpa
Pages (from-to)087
Journal Journal of High Energy Physics
Volume1404
Early online date11 Apr 2014
DOIs
StatePublished - 2014

Abstract

A search for previously unobserved decays of beauty baryons to the final states K0Spπ−KS0pπ− and K0SpK−KS0pK− is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions. The Λ0b→K¯¯¯¯¯0pπ−Λb0→K¯0pπ− decay is observed with a significance of 8.σ, with branching fractionB(Λ0b→K¯¯¯¯¯0pπ−)=(1.26±0.19±0.09±0.34±0.05)×10−5,B(Λb0→K¯0pπ−)=(1.26±0.19±0.09±0.34±0.05)×10−5,where the uncertainties are statistical, systematic, from the ratio of fragmentation fractions fΛ0b/fd,fΛb0/fd, and from the branching fraction of the B0 → K0π+π normalisation channel, respectively. A first measurement is made of the CP asymmetry, givingACP(Λ0b→K¯¯¯¯¯0pπ−)=0.22±0.13(stat)±0.03(syst).ACP(Λb0→K¯0pπ−)=0.22±0.13(stat)±0.03(syst).No significant signals are seen for Λ0b→K0SpK−Λb0→KS0pK− decays, Ξ0bΞb0 decays to both the K0Spπ−KS0pπ− and K0SpK−KS0pK− final states, and the Λ0b→D−s(→K0SK−)pΛb0→Ds−(→KS0K−)p decay, and upper limits on their branching fractions are reported.

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