Abstract
A search for previously unobserved decays of beauty baryons to the final states K0spπ- and K0spK- 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-0 pπ- decay is observed with a significance of 8.6σ, with branching fraction B(Λ0b → K-0 pπ−) = (1.26 ± 0.19 ± 0.09 ± 0.34 ± 0.05) × 10−5, 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 ACP (Λ0b → K-0 pπ−) = 0.22 ± 0.13 (stat) ± 0.03 (syst). No significant signals are seen for Λ0b → K0spK- decays, Ξ0b decays to both the K0spπ- and K0spK- final states, and the Λ0b → D-s(→ K0sK-)p decay, and upper limits on their branching fractions are reported.
Original language | English |
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Article number | 87 |
Number of pages | 24 |
Journal | Journal of High Energy Physics |
Volume | 2014 |
Issue number | 4 |
DOIs | |
Publication status | Published - 11 Apr 2014 |
Keywords
- B physics
- Branching fraction
- Flavor physics
- Hadron-hadron scattering
ASJC Scopus subject areas
- Nuclear and High Energy Physics