Zooming in on $B\to K^{\ast }\ell \ell$ decays at low recoil

Simon Braß, Gudrun Hiller, Ivan Nisandzic

We analyse $B\to K^{\ast }\ell \ell$ decays in the region of low hadronic recoil, where an operator product expansion (OPE) in $1/m_b$ applies. Using a local model for charm contribut…