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This paper studies the leading chiral corrections to heavy quark-diquarksymmetry predictions for doubly heavy baryon semileptonic decay form factors.We derive the coupling between heavy diquarks and weak current in the limit ofheavy quark-diquark symmetry, and construct the chiral Lagrangian for doublyheavy baryons coupled to weak current. We evaluate chiral corrections to doublyheavy baryon zero-recoil semileptonic decay for both unquenched and partiallyquenched QCD. This theory is used to derive chiral extrapolation expressionsfor measurements of form factors of doubly heavy baryon zero-recoilsemileptonic decay in lattice QCD simulations.

Chiral corrections to heavy quark-diquark symmetry predictions for doubly heavy baryon zero-recoil semileptonic decay