Abstract
Using a data sample of 980 ${\rm fb}^{-1}$ of $e^+e^-$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider, we report the results of a study of the decays of the $\Omega_c^0$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $\Omega_c^0$ into $\Omega^-\pi^+\pi^0$, $\Omega^-\pi^+\pi^-\pi^+$, $\Xi^-K^-\pi^+\pi^+$, and $\Xi^0K^-\pi^+$, as well as the first measurements of the branching fractions of the $\Omega_c^0$ into $\Xi^-\bar{K}^0\pi^+$, $\Xi^0\bar{K}^0$, and $\Lambda \bar{K}^0\bar{K}^0$, all with respect to the $\Omega^-\pi^+$ decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay $\Omega_c^0\to\Sigma^+K^-K^-\pi^+$.
Highlights
The Ω0c comprises the combination of a charm quark and two strange quarks [1]
Using a data sample of 980 fb−1 of eþe− annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy eþe− collider, we report the results of a study of the decays of the Ω0c charmed baryon into hadronic final states
We report the most precise measurements to date of the relative branching fractions of the Ω0c into Ω−πþπ0, Ω−πþπ−πþ, Ξ−K−πþπþ, and Ξ0K−πþ, as well as the first measurements of the branching fractions of the Ω0c into Ξ−K 0πþ, Ξ0K 0, and ΛK 0K 0, all with respect to the Ω−πþ decay
Summary
The Ω0c comprises the combination of a charm quark and two strange quarks [1]. The ground-state Ω0c has the ss diquark in a JP 1⁄4 1þ configuration, and decays weakly. We present the most precise measurements of the branching fractions of Ω0c decays into the four decay modes (Ω−πþπ0, Ω−πþπ−πþ, Ξ−K−πþπþ, Ξ−K 0πþ). These modes have previously been measured by the CLEO [2] and/or BABAR [4] Collaborations. Measuring the branching fractions of all the charmed hadrons helps disentangle the various processes involved and adds to our knowledge of the dynamics of charmed baryon decays. This analysis uses a data sample of eþe− annihilations recorded by the Belle detector [7] operating at the KEKB asymmetric-energy eþe− collider [8]. The Ω0c particles in this analysis are produced in continuum charm production and are of higher momentum than those that are decay products of B mesons, so the data set used in this analysis includes the Belle data taken at beam energies corresponding to the other Υ resonances and the nearby continuum (eþe− → qq , where q ∈ fu; d; s; cg)
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