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The $\Xi_c^0$ baryon is unstable and usually decays into charmless finalstates by the $c \to s u\overline{d}$ transition. It can, however, alsodisintegrate into a $\pi^-$ meson and a $\Lambda_c^+$ baryon via $s$ quarkdecay or via $cs\to d c$ weak scattering. The interplay between the latter twoprocesses governs the size of the branching fraction ${\cal{B}}$$(\Xi_c^0\to\pi^-\Lambda_c^+)$, first measured here to be $(0.55\pm 0.02 \pm 0.18)$%, wherethe first uncertainty is statistical and second systematic. This result iscompatible with the larger of the theoretical predictions that connect modelsof hyperon decays using partially conserved axial currents and SU(3) symmetrywith those involving the heavy-quark expansion and heavy-quark symmetry. Inaddition, the branching fraction of the normalization channel,${\cal{B}}(\Xi_c^+\to p K^- \pi^+) = (1.135 \pm 0.002 \pm 0.387)$% is measured.

First branching fraction measurement of the suppressed decay $\Xi_c^0\to \pi^-\Lambda_c^+$