Branching fraction measurement of the decay $B^{+}\to \psi (2S)\phi (1020)K^{+}$

The branching fraction of the decay $B^{+}\to \psi (2S)\phi (1020)K^{+}$, relative to the topologically similar decay $B^{+}\to J\mathrm{/}\psi \phi (1020)K^{+}$, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9{\mathrm{f}\mathrm{b}}^{-1}$. The ratio is found to be $0.061\pm 0.004\pm 0.009$, where the first uncertainty is statistical and the second systematic. Using the world-average branching fraction for $B^{+}\to J\mathrm{/}\psi \phi (1020)K^{+}$, the branching fraction for the decay $B^{+}\to \psi (2S)\phi (1020)K^{+}$ is found to be $(3.0\pm 0.2\pm 0.5\pm 0.2)\times {10}^{-6}$, where the first uncertainty is statistical, the second systematic, and the third is due to the branching fraction of the normalization channel.