Study of B+c decays to charmonia and three light hadrons

Journal of High Energy Physics. 2022. Article 65.

Philippov A., Aaij R., Abdelmotteleb A. S., Abellán Beteta C., Abudinen Gallego F. J., Ackernley T., Adeva B., Adinolfi M., Arzymatov K., Belavin V., Borisyak M., Boldyrev A., Derkach D., Hushchyn M., Karpov M., Maevskiy A., Mokhnenko S., Popov S., Ratnikov F., Ryzhikov A., Ustyuzhanin A.

Using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1 collected with the LHCb detector, seven decay modes of the B+cBc+ meson into a J/ψ or ψ(2S) meson and three charged hadrons, kaons or pions, are studied. The decays B+cBc+ → (ψ(2S) → J/ψπ+π−)π+, B+cBc+ → ψ(2S)π+π−π+, B+cBc+ → J/ψK+π−π+ and B+cBc+ → J/ψK+K−K+ are observed for the first time, and evidence for the B+cBc+ → 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 B+cBc+ 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.

Keywords: HEP, Big Data analysis

Publication based on the results of: Machine learning to check and improve the quality of data collected at the Large Hadron Collider and other particle physics experiments (2022)