Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays

Abstract

A study of $B^{+}\to J/\psi \eta K^{+}$ decays, followed by $J/\psi \to {\mu }^{+}{\mu }^{-}$ and $\eta \to \gamma \gamma$, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb${}^{-1}$. The $J/\psi \eta$ mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the $B^{+}\to \left({\psi }_2(3823)\to J/\psi \eta \right)K^{+}$ and $B^{+}\to \left(\psi (4040)\to J/\psi \eta \right)K^{+}$ decays with significance of 3.4 and 4.7~standard deviations, respectively. This constitutes the~first~evidence for the ${\psi }_2(3823)\to J/\psi \eta$ decay.

arXiv comment29 pages, 7 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-047.html (LHCb public pages)

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Cited by in corpus (3)

• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
• Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model
• Spectrum of the molecular tetraquarks: Unraveling the $T_{cs0}(2900)$ and $T_{c\bar{s}0}^a(2900)$