Study of Inclusive B- and Bbar0 Decays to Flavor-Tagged D, D_s and Lambda_c

Abstract

We report on a study of inclusive $B^{-}$ and ${\bar{B}}^0$ meson decays to $D^{0}X$, ${\bar{D}}^{0}X$, $D^{+}X$, $D^{-}X$, $D_s^{+}X$, $D_s^{-}X$, ${\Lambda }_c^{+}X$, ${\bar{\Lambda }}_c^{-}X$, based on a sample of 231 million $B\bar{B}$ events recorded with the BABAR detector at the ${\rm Y}(4S)$ resonance. Events are selected by completely reconstructing one $B$ and searching for a reconstructed charm particle in the rest of the event. From the measured branching fractions of these decays, we infer the number of charm and anti-charm particles per $\bar{B}$ decay, separately for charged and neutral parents. We derive the total charm yield per $B^{-}$ decay, $n_c^{-}=1.202\pm 0.023\pm 0.040_{-0.029}^{+0.035}$, and per ${\bar{B}}^0$ decay, $n_c^0=1.193\pm 0.030\pm 0.034_{-0.035}^{+0.044}$ where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties. We also present the charm momentum distributions measured in the $\bar{B}$ rest frame.

16 pages, 24 postscript figues, submitted to PRD