A search for previously unobserved decays of beauty baryons to the final states K0 spπ- 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 Λ0 b → ̄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 Λ 0 b/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 Λ0 b → K0 spK - decays, Ξ0 b decays to both the K 0 spπ- and K0 spK - final states, and the Λ0 b → D- s(→ K0 sK-)p decay, and upper limits on their branching fractions are reported.

Searches for Λ0 b and Ξ0 b decays to K0 spπ- and K 0 spK- final states with first observation of the Λ0 b → k0 sp7π - decay / R., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. A. J., R., S., A., S., A., Y., A., L. b., A., J., A., R., A., M. b., A., J., A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - STAMPA. - 2014:(2014). [10.1007/JHEP04(2014)087]

Searches for Λ0 b and Ξ0 b decays to K0 spπ- and K 0 spK- final states with first observation of the Λ0 b → k0 sp7π - decay

G. Casse;SARTI, ALESSIO;SCIUBBA, Adalberto;
2014

Abstract

A search for previously unobserved decays of beauty baryons to the final states K0 spπ- 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 Λ0 b → ̄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 Λ 0 b/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 Λ0 b → K0 spK - decays, Ξ0 b decays to both the K 0 spπ- and K0 spK - final states, and the Λ0 b → D- s(→ K0 sK-)p decay, and upper limits on their branching fractions are reported.
2014
Electroweak Interaction, Forward Physics, Hadron-Hadron Scattering, Particle and Resonance Production
01 Pubblicazione su rivista::01a Articolo in rivista
Searches for Λ0 b and Ξ0 b decays to K0 spπ- and K 0 spK- final states with first observation of the Λ0 b → k0 sp7π - decay / R., A., B., A., M., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. A. J., R., S., A., S., A., Y., A., L. b., A., J., A., R., A., M. b., A., J., A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - STAMPA. - 2014:(2014). [10.1007/JHEP04(2014)087]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/665111
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