Speaker
Jonas Kohnen
(RWTH Aachen University)
Description
Non-perturbative matrix elements of four-quark operators are essential ingredients for the determination of heavy meson lifetimes. The gradient flow formalism provides a way for their calculation in lattice gauge theory. This requires the knowledge of the coefficients of the short-flow-time expansion of the corresponding operators, which can be calculated in perturbation theory. In this talk, the relevant four-quark operators and the calculation of their short-flow-time expansions through NNLO QCD will be described.
Authors
Fabian Lange
(University of Zurich)
Jonas Kohnen
(RWTH Aachen University)
Robert Harlander
(RWTH Aachen University)
