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Charmed baryon decays at Belle and Belle II

Jaeyoung Kim

Abstract

Belle and Belle II experiments have collected $e^+e^-$ collision data with center-of-mass energies at or near the $Υ(4S)$ resonance. Using total $1.4\,\mathrm{ab}^{-1}$ combined dataset, we present new measurements of branching fractions for $Ξ_c^{0/+}$ and $Λ_c^+$ 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.

Charmed baryon decays at Belle and Belle II

Abstract

Belle and Belle II experiments have collected collision data with center-of-mass energies at or near the resonance. Using total combined dataset, we present new measurements of branching fractions for and baryons, including several first observations. Additionally, we report the initial search for violation in singly Cabibbo-suppressed three-body decays of charmed baryons, providing a test of -spin symmetry.
Paper Structure (9 sections, 2 equations, 2 figures, 5 tables)

This paper contains 9 sections, 2 equations, 2 figures, 5 tables.

Table of Contents

  1. Introduction
  2. Branching Fractions and Rare Decays
  3. $\Xi_c^0 \to \Xi^0h\;(h=\pi^0,\eta,\eta^{\prime})$
  4. $\Xi_c^0 \to \Lambda h\;(h=\pi^0,\eta,\eta^{\prime})$
  5. $\Xi_c^+ \to pK_S^0, \Lambda \pi^+, \Sigma^0\pi^+$
  6. $\Xi_c^+ \to \Sigma^+K_S^0, \Xi^0\pi^+, \Xi^0K^+$
  7. $\Lambda_c^+ \to p K_S^0 \pi^0$
  8. Search for CP violation
  9. Summary

Figures (2)

  • Figure 1: Invariant mass distributions for the reconstructed (a) $\Xi_c^0 \to \Xi^0\pi^0$, (b) $\Xi^0\eta$, and (c) $\Xi^0\eta^{\prime}$ candidates. The blue solid curves represent the total fit, while the dashed lines indicate the background components. The left and right columns correspond to Belle and Belle II samples, respectively. Figure adapted from Ref. Belle:2024ikp.
  • Figure 2: Invariant mass distributions for (a) $\Xi_c^0 \to \Lambda \eta$, (b) $\Lambda \eta^{\prime}$, and (c) $\Lambda \pi^0$ candidates reconstructed from the combined Belle and Belle II data samples. The total fit results are denoted by solid blue curves, with the background contributions represented by red dashed lines. Figure adapted from Ref. Belle:2025qrq.