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We study the ratio of fragmentation fractions, $f_{\Xi_b}/f_{\Lambda_b}$,from the measurement of $\Xi_b^0\to \Xi_c^+\pi^-$ and $\Lambda_b^0\to\Lambda_c^+\pi^-$ with $\Xi_{c}^{+}/\Lambda_{c}^{+}\to p K^-\pi^+$. With thebranching fraction $\mathcal{B}(\Xi_c^+\to pK^-\pi^+)=(2.2\pm0.8)\%$ obtainedunder the U-spin symmetry, the fragmentation ratio is determined as$f_{\Xi_b}/f_{\Lambda_b}$=$0.054\pm0.020$. To reduce the above uncertainties,we suggest to measure the branching fractions of $\Xi_c^+\to p \overlineK^{*0}$ and $\Lambda_c^+\to \Sigma^+ K^{*0}$ at BESIII, Belle(II) and LHCb.

Fragmentation-fraction ratio $f_{\Xi_b}/f_{\Lambda_b}$ in $b$- and $c$-baryon decays