With a distinctive internal structure from all established hadrons, the beauty-charmed baryons ${\mathrm{\Xi }}_{bc}$ can provide us with new points of view to decipher the strong interaction. In this work, we point out that the inclusive ${\mathrm{\Xi }}_{bc}\to {\mathrm{\Xi }}_{cc}^{++}+X$ decay is a golden channel for the experimental discovery of ${\mathrm{\Xi }}_{bc}$ at the LHC. A unique feature of this process is that the ${\mathrm{\Xi }}_{cc}^{++}$ is displaced, which greatly reduces the combinatorial background. A feasibility analysis is performed on the ${\mathrm{\Xi }}_{bc}^{+}$ search, which is expected to have a longer lifetime than ${\mathrm{\Xi }}_{bc}^0$ and thus a better displacement resolution. The ${\mathrm{\Xi }}_{bc}^{+}\to {\mathrm{\Xi }}_{cc}^{++}+X$ branching ratio is calculated within the heavy diquark effective theory. Combining the production rate of ${\mathrm{\Xi }}_{bc}$ and the detection efficiency of ${\mathrm{\Xi }}_{cc}^{++}$, we anticipate that hundreds of signal events will be collected during LHCb Run 3.

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• Effective field theory
• Particle decays
• Heavy baryons