Аннотация

The observation of the decay Ξb →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 Ξb baryons detected in the decay Ξb →J/ψΛK is measured relative to that of Λb 0 baryons using the decay Λb 0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0<y<4.5, the measured ratio is [Formula presented][Formula presented]=(4.19±0.29 (stat)±0.15 (syst))×10−2, where fΞb and fΛb 0 are the fragmentation fractions of b→Ξb and b→Λb 0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb and Λb 0 baryons is measured to be M(Ξb )−M(Λb 0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.

Язык оригиналаанглийский
Страницы (с-по)265-273
Число страниц9
ЖурналPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Том772
DOI
СостояниеОпубликовано - 10 сен 2017

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