@article{531e181898ac47f5a829ce96ee6b2ad3, title = "Measurement of the ratio of branching fractions of the decays $\Lambda^0_b\to\psi(2S) \Lambda$ and $\Lambda^0_b\!\to J/\psi \Lambda$", abstract = "Using $pp$ collisions corresponding to 3$\,\text{fb}^{-1}$ integrated luminosity, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8$\,\text{TeV}$, the ratio of branching fractions \begin{align*} \mathcal{B}(\Lambda^0_b\!\to\psi(2S) \Lambda )/\mathcal{B}(\Lambda^0_b\!\to J/\psi \Lambda)= 0.513 \pm 0.023\, (\text{stat}) \pm 0.016 \, (\text{syst}) \pm 0.011\, (\mathcal{B}) \end{align*} is determined. The first uncertainty is statistical, the second is systematic and the third is due to the external branching fractions used.", author = "Peter Clarke and Greig Cowan and R. Currie and Stephan Eisenhardt and Silvia Gambetta and Franz Muheim and Matthew Needham and Marco Pappagallo and Stephen Playfer and Mark Williams and LHCb Collaboration", year = "2019", month = mar, day = "22", doi = "10.1007/JHEP03(2019)126", language = "English", volume = "1903", pages = "126", journal = " Journal of High Energy Physics", issn = "1126-6708", publisher = "Springer-Verlag", }