Publications associated with TORCH

Observation of the Decays Λ0b→χc1pK− and Λ0b→χc2pK−

Physical Review Letters American Physical Society 119 (2017) 062001-

R Aaij, B Adeva, M Adinolfi, N Harnew

The first observation of the decays $Λ_{b}^{0}→χ_{c1}pK^{-}$ and $Λ_{b}^{0}→χ_{c2}pK^{-}$ is reported using a data sample corresponding to an integrated luminosity of $3.0  fb^{-1}$, collected by the LHCb experiment in $pp$ collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: <p><p> $B(Λ_{b}^{0}→χ_{c1}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.242±0.014±0.013±0.009,$ $B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.248±0.020±0.014±0.009,$ $B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→χ_{c1}pK^{-})=1.02±0.10±0.02±0.05,$ <p><p>where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the $χ_{c1}→J/ψγ$ and $χ_{c2}→J/ψγ$ decays. Using both decay modes, the mass of the $Λ_{b}^{0}$ baryon is also measured to be $m_{Λ_{b}^{0}}=5619.44±0.28±0.26  MeV/c^{2}$, where the first and second uncertainties are statistical and systematic, respectively.</p></p></p></p>

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