Sep 9 – 13, 2019
Europe/Zurich timezone

## Evolution equation for B-meson distribution amplitude at two loops

Sep 12, 2019, 9:00 AM
25m
Cubiculaire

### Speaker

Alexander Manashov (Hamburg University)

### Description

The B-meson distribution amplitude is defined by the matrix element of a heavy-light quark operator between the vacuum and B-meson states. The scale dependence of the corresponding DA is governed by the renormalization group equation for this operator. At one loop the corresponding evolution kernel was derived by Lange and Neubert. I'll argue that the form of the kernel is strongly restricted by the conformal symmetry and present the answer for the two-loop kernel.

### Primary author

Alexander Manashov (Hamburg University)