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

Abstract

The $B^{+}\to J/\psi {\eta }^{\prime }{K}^{+}$ decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13TeV, corresponding to a total integrated luminosity of 9fb${}^{-1}$. The branching fraction of this decay is measured relative to the known branching fraction of the $B^{+}\to \psi (2S)K^{+}$ decays and found to be $$\frac{\mathcal{B}(B^{+}\to J/\psi {\eta }^{\prime }{K}^{+})}{\mathcal{B}(B^{+}\to \psi (2S)K^{+})}=\left(4.91\pm 0.47\pm 0.29\pm 0.07\right)\times 10^{-2},$$ where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the $J/\psi {\eta }^{\prime }$ mass distribution is performed and no signal of intermediate resonances is observed.

arXiv comment17 pages, 3 figures. All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-054.html (LHCb public pages)

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Cited by in corpus (1)

• The $B^{-}\to J/\psi {\eta }^{\prime }{K}^{-}$ reaction and the $Y(4710)$ and $K_0^{\ast }(1430)$ contributions