20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Hadronic matrix elements for exclusive rare $B$ decays

21 Jul 2011, 16:30
Oisans (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo

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


Mr Alexander Khodjamirian (Siegen University)


I will report on the QCD calculation of the hadronic matrix elements relevant for the exclusive rare $B$ decays, such as $B\to K^{(*)}\ell^+\ell^-$ and $B\to K^*\gamma$. 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 $B\to K^* \ell^+\ell^-$, is estimated.

Primary author

Mr Alexander Khodjamirian (Siegen University)

Presentation Materials