A Study of Production and Decays of Omega_c0 Baryons at BABAR

Abstract

Production and decay of ${\Omega }_c^0$ baryons is studied with $\sim 230{\mathrm{fb}}^{-1}$ of data recorded with the BABAR detector at the PEP-II $e^{+}{e}^{-}$ asymmetric-energy storage ring at SLAC. The ${\Omega }_c^0$ is reconstructed through its decays into ${\Omega }^{-}{\pi }^{+}$, ${\Omega }^{-}{\pi }^{+}{\pi }^{+}{\pi }^{-}$, and ${\Xi }^{-}{K}^{-}{\pi }^{+}{\pi }^{+}$ final states. The invariant mass spectra are presented and the signal yields are extracted. Ratios of branching fractions are measured relative to the ${\Omega }^{-}{\pi }^{+}$ mode \frac{{\cal B}(Ξ^-K^-π^+π^+)}{{\cal B}(Ω^-π^+)} &= 0.31 \pm 0.15\mathrm{(stat.)} \pm 0.04\mathrm{(syst.)}, \frac{{\cal B}(Ω^-π^+π^+π^-)}{{\cal B}(Ω^-π^+)} &< 0.30\qquad (90%\mathrm{CL}). The momentum spectrum (not corrected for efficiency) of ${\Omega }_c^0$ baryons is extracted from decays into ${\Omega }^{-}{\pi }^{+}$, establishing the first observation of ${\Omega }_c^0$ production from B decays.

16 pages, 2 figures