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# Observation of the $B^+ \rightarrow J/\psi \eta^{\prime} K^+$ decay

Mar 2023

The $B^+ \rightarrow J/\psi \eta^{\prime} K^+$ decay is observed for thefirst time using proton-proton collision data collected by the LHCb experimentat centre-of-mass energies of 7, 8, and 13TeV, corresponding to a totalintegrated luminosity of 9fb$^{-1}$. The branching fraction of this decay ismeasured relative to the known branching fraction of the $B^+ \rightarrow\psi(2S) K^+$ decays and found to be $$\frac{\mathcal{B}( B^+ \rightarrowJ/\psi \eta^{\prime}K^+)}{\mathcal{B}( B^+ \rightarrow \psi(2S)K^+} =\left(4.91\pm 0.47\pm0.29\pm0.07\right)\times10^{-2},$$ where the firstuncertainty is statistical, the second is systematic and the third is relatedto external branching fractions. A first look at the $J/\psi\eta^{\prime}$ massdistribution is performed and no signal of intermediate resonances is observed.

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