Observation of sizeable $\omega$ contribution to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays

Abstract

Resonant structures in the dipion mass spectrum from ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays, produced via $B^{+}\to K^{+}{\chi }_{c1}(3872)$ decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 $f{b}^{-1}$. A sizeable contribution from the isospin conserving ${\chi }_{c1}(3872)\to \omega J/\psi$ decay is established for the first time, $(21.4\pm 2.3\pm 2.0)\%$, with a significance of more than $7.1\sigma$. The amplitude of isospin violating decay, ${\chi }_{c1}(3872)\to {\rho }^{0}J/\psi$, relative to isospin conserving decay, ${\chi }_{c1}(3872)\to \omega J/\psi$, is properly determined, and it is a factor of six larger than expected for a pure charmonium state.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-045.html (LHCb public pages)

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• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
• Hidden-Charm Tetraquarks in a Mixture Model: Coupled-Channel Analysis with $c\bar{c}$ and Hadronic Molecular Components
• Two nearby states in the $X(3872)$ region: Resolving the radiative-decay ratio tension with ${\eta }_{c2}$
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• Study of ${\chi }_{bJ}(2P)\to \omega {\rm Y}(1S)$ at Belle
• Observation of the decay ${\chi }_{c1}(3872)\to J/\psi {\mu }^{+}{\mu }^{-}$
• Flavour Physics at LHCb -- 50 years of the KM paradigm
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• Search for the decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$ at BESIII