Form Factors and Long-Distance Effects in $B\to V(P) \ell^+\ell^-$ and $B\to V \gamma$

Abstract

I overview the hadronic input for the exclusive flavour-changing neutral-current $B$-decays with a vector ($V=K^*,\rho$) or pseudoscalar ($P=K,\pi$) meson in the final state. After presenting the current status of $B\to P,V$ form factors, I discuss the estimate of the charm-loop effect in $B\to K^{(*)} \ell^+\ell^-$ and $B\to K^* \gamma$.