Speaker
Description
We develop a non-perturbative approach to heavy-quark effective theory based on the instanton-induced heavy-light effective action. The formalism incorporates spontaneous chiral symmetry breaking and heavy-quark spin symmetry from the outset and is reformulated in terms of chirally rotated constituent light quarks interacting with Goldstone bosons. Heavy-meson states emerge dynamically as collective excitations of light and heavy quarks, with their masses determined by quark-loop dynamics. The resulting framework provides a direct connection between the instanton vacuum and the low-energy description of heavy hadrons, allowing for a systematic evaluation of HQET observables. In particular, the residual mass parameter $\bar\Lambda$, the kinetic and chromomagnetic matrix elements, and higher-dimensional heavy-quark operator expectation values can be computed consistently within a unified effective field theory framework. Furthermore, the effective action provides a natural realization of local and nonlocal effective gluonic operators in heavy-light systems, enabling the study of quark-gluon correlations and the evaluation of matrix elements relevant for higher-order HQET and operator product expansion analyses. This approach opens a new avenue for investigating non-perturbative aspects of heavy-light hadrons directly from the underlying QCD vacuum structure.
