Measurement of the $\Omega_c^0$ lifetime at Belle II

TL;DR

This paper reports a measurement of the $ m au(\Omega_c^0)$ lifetime using Belle II data, providing a precise value that aligns with recent findings and clarifies its position among weakly decaying charmed baryons.

Contribution

First measurement of the $ m au(\Omega_c^0)$ lifetime using Belle II data, confirming its longer lifetime compared to the shortest-lived charmed baryons.

Findings

Measured $ m au(\Omega_c^0)$ as 243 fs with uncertainties

Results agree with recent measurements

Indicates $ m au(\Omega_c^0)$ is not the shortest-lived charmed baryon

Abstract

We report on a measurement of the $\Omega_c^0$ lifetime using $\Omega_c^0 \to \Omega^-\pi^+$ decays reconstructed in $e^+e^-\to c\bar{c}$ data collected by the Belle II experiment and corresponding to $207~{\rm fb^{-1}}$ of integrated luminosity. The result, $\rm\tau(\Omega_c^0)=243\pm48( stat)\pm11(syst)~fs$, agrees with recent measurements indicating that the $\Omega_c^0$ is not the shortest-lived weakly decaying charmed baryon.