Charmed baryon decays at Belle and Belle II

TL;DR

This paper reports new measurements of charmed baryon decay branching fractions and explores $CP$ violation in these decays using extensive data from Belle and Belle II, advancing understanding of charm baryon behavior.

Contribution

It provides the first observations of certain charmed baryon decay modes and conducts the initial search for $CP$ violation in these processes.

Findings

New branching fraction measurements for $\xi_c^{0/+}$ and $\xi_c^+$ baryons.

First observations of several charmed baryon decay modes.

Initial search for $CP$ violation in singly Cabibbo-suppressed decays.

Abstract

Belle and Belle II experiments have collected $e^+e^-$ collision data with center-of-mass energies at or near the $\Upsilon(4S)$ resonance. Using total $1.4\,\mathrm{ab}^{-1}$ combined dataset, we present new measurements of branching fractions for $\Xi_c^{0/+}$ and $\Lambda_c^+$ baryons, including several first observations. Additionally, we report the initial search for $CP$ violation in singly Cabibbo-suppressed three-body decays of charmed baryons, providing a test of $U$-spin symmetry.