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We set up a zero recoil sum rule to constrain the form factors of the$\Lambda_b \to \Lambda_c$ transition. Our results are compared with the recentlattice calculation for these transitions. We find the same situation as in thecase for $B \to D^*$: The lattice results practically saturate the sum rules,leaving basically no room for excited states.

Zero-Recoil Sum Rules for $\Lambda_b \to \Lambda_c$ Form Factors