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.

29 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)

References in corpus (26)

• Multiquark Resonances
• Exotics: Heavy Pentaquarks and Tetraquarks
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• Observation of the resonant character of the $Z(4430{)}^{-}$ state
• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• The Z(4430) and a New Paradigm for Spin Interactions in Tetraquarks
• Hadro-Charmonium
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• X(3872) and Other Possible Heavy Molecular States
• Amplitude analysis of the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay
• Observation of a new charged charmoniumlike state in B -> J/psi K pi decays
• Evidence of Two Resonant Structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Study of the lineshape of the ${\chi }_{c1}(3872)$ state
• Heavy-quark spin and flavour symmetry partners of the X(3872) revisited: what can we learn from the one boson exchange model?
• A Theory of X and Z Multiquark Resonances
• Measurements of $\psi (2S)$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Observation of multiplicity-dependent prompt ${\chi }_{c1}(3872)$ and $\psi (2S)$ production in $pp$ collisions
• Observation of the $Y(4220)$ and $Y(4360)$ in the process $e^{+}{e}^{-}\to \eta J/\psi$
• Note on X(3872) production at hadron colliders and its molecular structure
• Observation of $e^{+}{e}^{-}\to \eta J/\psi$ at center-of-mass energy $sqrts=4.009$ GeV
• Study of $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ decays
• Study of $\eta -{\eta }^{\prime }$ mixing from measurement of $B_{(s)}^0\to J/\psi {\eta }^{(\prime )}$~decay rates
• Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
• Search for $X(3872)$ and $X(3915)$ decay into ${\chi }_{c1}{\pi }^0$ in $B$ decays at Belle
• Search for $B^0\to X(3872)\gamma$
• Observation of the decay ${\Lambda }_b^0\to {\chi }_{c1}p{\pi }^{-}$

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 $T_{c\bar{s}0}^a(2900)$