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Дата последнего поиска статьи во внешних источниках: 23 ноября 2017 г.
Аннотация:The observation of the decay Ξ−b→J/ψΛK− is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξ−b baryons detected in the decay Ξ−b→J/ψΛK− is measured relative to that of Λ0b baryons using the decay Λ0b→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0<y<4.5, the measured ratio is
fΞ−bfΛ0bB(Ξ−b→J/ψΛK−)B(Λ0b→J/ψΛ)=(4.19±0.29(stat)±0.15(syst))×10−2,
where fΞ−b and fΛ0b are the fragmentation fractions of b→Ξ−b and b→Λ0b transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξ−b and Λ0b baryons is measured to be
M(Ξ−b)−M(Λ0b)=177.08±0.47(stat)±0.16(syst)MeV/c2.