  Recent experimental progress measuring the branching fractions of the
heavy-baryon semileptonic decays $\Xi_c\to \Xi \ell \nu$ has stimulated
theoretical interest and motivates precise lattice calculations of the form
factors. Here we present such a calculation using domain-wall fermions for the
up, down, and strange quarks, and an anisotropic clover action for the charm
quark. We use four ensembles generated by the RBC and UKQCD collaborations,
with lattice spacings between 0.111 and 0.073 fm and pion masses ranging from
420 to 230 MeV. Our preliminary results for the form factors are larger in
magnitude than previous lattice results.
