Study of $B_c^{+}$ meson decays to charmonia plus multihadron final states

Abstract

Four decay modes of the $B_c^{+}$ meson into a $J/\psi$ meson and multiple charged kaons or pions are studied using proton-proton collision data, collected with the~LHCb detector at centre-of-mass energies of 7, 8, and 13~TeV and corresponding to an integrated luminosity of $9$~fb${}^{-1}$. The decay $B_c^{+}\to J/\psi K^{+}{K}^{-}{\pi }^{+}{\pi }^{+}{\pi }^{-}$ is observed for the first time, and evidence for the $B_c^{+}\to J/\psi 4{\pi }^{+}3{\pi }^{-}$ decay is found. The decay $B_c^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$ is observedand and the previous observation of the $B_c^{+}\to \psi (2S){\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay is confirmed using the $\psi (2S)\to J/\psi {\pi }^{+}{\pi }^{-}$ decay mode. Ratios of the branching fractions of these four $B_c^{+}$ decay channels are measured.

arXiv comment18 pages, 6 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-025.html (LHCb public pages)

References in corpus (14)

• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• sPlot: a statistical tool to unfold data distributions
• Performance of the LHCb RICH detector at the LHC
• Decay Chain Fitting with a Kalman Filter
• Performance of the LHCb Outer Tracker
• Measurement of the track reconstruction efficiency at LHCb
• Mass distributions marginalized over per-event errors
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Improved performance of the LHCb Outer Tracker in LHC Run 2
• B_c Decays and Lifetime in QCD Sum Rules
• Physics of B_c mesons
• Semileptonic B_c-meson decays in sum rules of QCD and NRQCD
• Light hadron production in $B_c\to J/\psi +X$ decays