Inclusive decays of<i>B</i>mesons to charmonium

Abstract

We have used the CLEO-II detector at the Cornell Electron Storage Ringe (CESR) to study the inclusive production of charmonium mesons in a sample of 2.15 million BB\ifmmode\bar\else\textasciimacron\fi{} events. We find inclusive branching fractions of (1.12\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.06)% for B\ensuremath{\rightarrow}J/\ensuremath{\psi}X, (0.34\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.03)% for B\ensuremath{\rightarrow}\ensuremath{\psi}\ensuremath{'}X, and (0.40\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.04)% for B\ensuremath{\rightarrow}${\mathrm{\ensuremath{\chi}}}_{\mathit{c}1}$X. We also find some evidence for the inclusive production of ${\mathrm{\ensuremath{\chi}}}_{\mathit{c}2}$, and set an upper limit for the branching fraction of the inclusive decay B\ensuremath{\rightarrow}${\mathrm{\ensuremath{\eta}}}_{\mathit{c}}$X of 0.9% at 90% confidence level. Momentum spectra for inclusive J/\ensuremath{\psi}, \ensuremath{\psi}\ensuremath{'}, and ${\mathrm{\ensuremath{\chi}}}_{\mathit{c}1}$ production are presented. These measurements are compared to theoretical calculations.