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We derive the $\Lambda_b \to \Lambda_c$ form factors for the Standard Modeland beyond at second order in Heavy Quark Effective Theory (HQET), applying therecently-proposed Residual Chiral Expansion (RCE) to reduce the set of unknownsubsubleading hadronic functions to a single, highly-constrained function, thatis fully determined by hadron mass parameters at zero recoil. We fit a formfactor parametrization based on these results to all available Lattice QCD(LQCD) predictions and experimental data. We find that the constrained andpredictive structure of the form factors under the RCE is in excellentagreement with LQCD predictions and experimental data, as well as priorHQET-based fits.

Appraising constrained second-order power corrections in HQET with $\Lambda_b \to \Lambda_c l \nu$