Observation of baryon number violation (BNV) in laboratory experiments would constitute unambiguous evidence for physics beyond the Standard Model. We propose dedicated searches for apparent BNV in charm-baryon decays, ${\mathrm{\Lambda }}_c^{+}\to M^{+}+$ missing energy ($M=\pi ,K$), where the missing energy stems from a resonance. These channels have not been explored experimentally so far, despite the relatively clean environment potentially provided by near-${\mathrm{\Lambda }}_c^{+}{\overline{\mathrm{\Lambda }}}_c^{-}$ threshold production at $e^{+}{e}^{-}$ colliders. Performing state-of-the-art Monte Carlo simulations for the proposed Super Tau-Charm Facility (STCF), we evaluate the signal efficiencies and derive projected model-independent sensitivities under the assumption of negligible background. We further interpret these sensitivities within two theoretical frameworks: a sterile-neutrino-extended low-energy effective field theory ($\nu \mathrm{LEFT}$) and R-parity-violating (RPV) supersymmetry. With an integrated luminosity of $1{\mathrm{ab}}^{-1}$, STCF can probe new-physics scales of several TeV in the $\nu \mathrm{LEFT}$ description and constrain the RPV model parameter ${\lambda }_{212}^{\prime \prime }/m_{\tilde{q}}^2$ down to about $0.1{\mathrm{TeV}}^{-2}$. Our results demonstrate that STCF provides a highly competitive opportunity for probing BNV interactions in rare charm-baryon decays.

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• Hypothetical particle production
• Phenomenology
• Rare decays
• Signatures with missing energy
• Signatures with new fermions
• Supersymmetric models
• Heavy neutrinos
• Hypothetical fermions
• Sterile neutrinos