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The decays $ \Lambda_b^0 \to \psi(2S)pK^-$ and $ \Lambda_b^0 \to J/\psi \pi^+\pi^- pK^-$ are observed in a data sample corresponding to an integratedluminosity of 3fb$^{-1}$, collected in proton-proton collisions at 7 and 8TeVcentre-of-mass energies by the LHCb detector. The $\psi(2S)$ mesons arereconstructed through the decay modes $\psi(2S)\to\mu^+\mu^-$ and $\psi(2S)\toJ/\psi\pi^+\pi^-$. The branching fractions relative to that of $ \Lambda_b^0\to J/\psi pK^-$ are measured to be \begin{eqnarray*}  \frac{\mathcal{B}(\Lambda_b^0 \to \psi(2S) pK^-)}  {\mathcal{B}(\Lambda_b^0 \to J/\psi pK^-)}  & = & (20.70\pm 0.76\pm 0.46\pm 0.37)\times10^{-2} \,,  \frac{\mathcal{B}(\Lambda_b^0 \to J/\psi \pi^+ \pi^- pK^-)}  {\mathcal{B}(\Lambda_b^0 \to J/\psi pK^-)}  & = & (20.86\pm 0.96\pm 1.34)\times10^{-2} \,, \end{eqnarray*} where thefirst uncertainties are statistical, the second are systematic and the third isrelated to the knowledge of $J/\psi$ and $\psi(2S)$ branching fractions.  The mass of the $\Lambda_b^0$ baryon is measured to be $$ M(\Lambda_b^0) =5619.65 \pm 0.17 \pm 0.17\mathrm{MeV}/c^2,$$ where the uncertainties arestatistical and systematic.

the journal of high energy physics/the journal of high energy physics

Observation of $ \Lambda_b^0 \to \psi(2S)pK^-$ and $ \Lambda_b^0 \to  J/\psi \pi^+ \pi^- pK^-$ decays and a measurement of the $\Lambda_b^0$ baryon  mass