Speaker
Bjorn O. Lange
(Siegen University)
Description
In the past two decades significant advances have been made
on the perturbative ingredients of the leading-power factorization
formula for $B \to X_u \ell \nu$, as well as local parameters in the
heavy-quark expansion. An update for partial rates in the
"shape-function region" is overdue. The main uncertainty still
concerns the leading-power shape function, where we explore novel
ideas and generate reliable error estimates. Along the way new lessons
were learned that we would like to share and discuss.
Author
Bjorn O. Lange
(Siegen University)
