Study of ${\mathrm{B}}_{\mathrm{c}}^{+}$ decays to charmonia and three light hadrons

Abstract

Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb⁻¹ collected with the LHCb detector, seven decay modes of the ${\mathrm{B}}_{\mathrm{c}}^{+}$ meson into a J/ψ or ψ(2S) meson and three charged hadrons, kaons or pions, are studied. The decays ${\mathrm{B}}_{\mathrm{c}}^{+}$ → (ψ(2S) → J/ψπ⁺π⁻)π⁺, ${\mathrm{B}}_{\mathrm{c}}^{+}$ → ψ(2S)π⁺π⁻π⁺, ${\mathrm{B}}_{\mathrm{c}}^{+}$ → J/ψK⁺π⁻π⁺ and ${\mathrm{B}}_{\mathrm{c}}^{+}$ → J/ψK⁺K⁻K⁺ are observed for the first time, and evidence for the ${\mathrm{B}}_{\mathrm{c}}^{+}$ → ψ(2S)K⁺K⁻π⁺, decay is found, where J/ψ and ψ(2S) mesons are reconstructed in their dimuon decay modes. The ratios of branching fractions between the different ${\mathrm{B}}_{\mathrm{c}}^{+}$ 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.