HEAVY HADRON CHIRAL PERTURBATION-THEORY

The formalism and applications of chiral perturbation theory for hadrons containing a single heavy quark are discussed. We emphasize the utility of working directly with the velocity-dependent ''super'' fields which appear in the chiral lagrangian and whose interactions manifestly preserve heavy quark spin symmetry rather than their individual spin components. Chiral logarithm corrections to meson and baryon Isgur-Wise functions are found using these fields. We also identify a unique dimension-5 operator which couples the axial vector Goldstone current to the heavy antitriplet baryon field T(Q). We then compute the differential rate for the spin symmetry violating decay T(b)(upsilon) --> T(c)(upsilon')lnu(l)piBAR. The ratio of this decay rate to that for the corresponding pure semileptonic transition can be studied away from the zero recoil point.