Europhysics Conference on High-Energy Physics 2011

Hadronic matrix elements for exclusive rare B decays

21 juil. 2011, 16:30

15m

Oisans (Alpes Congrès - Alpexpo)

Parallel session talk Flavour Physics and Fundamental Symmetries Flavour Physics and Fundamental Symmetries

Orateur

M. Alexander Khodjamirian (Siegen University)

Description

I will report on the QCD calculation of the hadronic matrix elements relevant for the exclusive rare $B$ decays, such as $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$. The hadronic input for the decay observables, in addition to the heavy-light form factors, contains specific contributions, generated by the four-quark and penguin operators, such as the charm-loop effects. The corresponding hadronic matrix elements are calculated by the same method as the form factors, applying OPE and light-cone sum rules in QCD. This technique allows one to take into account the nonfactorizable soft-gluon contributions. The results are expressed in terms of (process-dependent) corrections to the short-distance coefficients of the effective Hamiltonian. The impact of these corrections on the most important observables, e.g., on the forward-backward asymmetry in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$, is estimated.

Documents de présentation

Transparents

FP_Khodjamirian.pdf