Speaker
Oliver Witzel
(University of Siegen)
Description
Gradient flow (GF) is a powerful concept to calculate important quantities in heavy flavor physics on the lattice. We showcase two examples:
First we demonstrate using GF to obtain matching factors for heavy-light currents fully nonperturbatively. This addresses the challenge that due to the large mass difference matching factors for a "mixed action setup" are often required. GF provides a procedure to also obtain the needed correction factor $\rho$ nonperturbatively.
Secondly, we present our results to determine bag-parameters describing neutral meson mixing or heavy meson lifetimes using GF in combination with the short-flow-time expansion (SFTX).
Author
Oliver Witzel
(University of Siegen)