A Study of Production and Decays of Omega_c0 Baryons at BABAR

TL;DR

This paper reports on the production and decay properties of Omega_c^0 baryons using data from the BABAR experiment, including measurements of branching ratios and the first observation of Omega_c^0 production from B decays.

Contribution

It provides new measurements of Omega_c^0 decay branching ratios and reports the first observation of Omega_c^0 production from B meson decays.

Findings

Measured branching ratio of rac{{ m B}( ext{Xi}^-K^- ext{pi}^+ ext{pi}^+)}{{ m B}( ext{Omega}^- ext{pi}^+) = 0.31 \

Established the first observation of Omega_c^0 production from B decays.

Provided invariant mass spectra and extracted signal yields for Omega_c^0 decays.

Abstract

Production and decay of $\Omega_c^0$ baryons is studied with $\sim230 \mathrm{fb}^{-1}$ 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}(\Xi^-K^-\pi^+\pi^+)}{{\cal B}(\Omega^-\pi^+)} &= 0.31 \pm 0.15\mathrm{(stat.)} \pm 0.04\mathrm{(syst.)}, \frac{{\cal B}(\Omega^-\pi^+\pi^+\pi^-)}{{\cal B}(\Omega^-\pi^+)} &< 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.