Speaker
Tobias Hurth
(Johannes-Gutenberg-Universitaet Mainz (DE))
Summary
We discuss the power corrections to the inclusive mode $\bar B\rightarrow X_s \ell^+ \ell^-$ and to the exclusive mode $B \rightarrow K^* \ell^+\ell^-$ and their role for the so-called LHCb anomalies. In particular, we analyze the factorization to subleading power in the flavor changing neutral current $\bar B\rightarrow X_s \ell^+ \ell^-$. We compute the so-called resolved contributions. In these contributions the photon couples to light partons instead of connecting directly to the effective weak-interaction vertex. They represent an irreducible uncertainty in the inclusive $\bar B\rightarrow X_s \ell^+ \ell^-$ decay which cannot be removed by relaxing the experimentally necessary cuts in the hadronic mass spectrum.
