Study of the $B_c^{+}$ decays into charmonia and three light hadrons

Abstract

Using proton-proton collision data, corresponding to an integrated luminosity of $9f{b}^{-1}$ collected with the LHCb detector, seven decay modes of the $B_c^{+}$ meson into a $J/\psi$ or $\psi (2S)$ meson and three charged hadrons, kaons or pions, are studied. The decays $B_c^{+}\to (\psi (2S)\to J/\psi {\pi }^{+}{\pi }^{-}){\pi }^{+}$, $B_c^{+}\to \psi (2S){\pi }^{+}{\pi }^{+}{\pi }^{-}$, $B_c^{+}\to J/\psi K^{+}{\pi }^{+}{\pi }^{-}$ and $B_c^{+}\to K^{+}{K}^{+}{K}^{-}$ are observed for the first time, and evidence for the $B_c^{+}\to \psi (2S)K^{+}{K}^{-}{\pi }^{+}$ decay is found, where $J/\psi$ and $\psi (2S)$ mesons are reconstructed in their dimuon decay modes. The ratios of branching fractions between the different $B_c^{+}$ decays are reported as well as the fractions of the decays proceeding via intermediate resonances. The results largely support the factorisation approach used for a theoretical description of the studied decays.

arXiv comment27 pages, 5 figures, All figures and tables are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-034.html (LHCb public pages)"

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