$k_T$ factorization of exclusive $B$ meson decays
  I review recent progress on exclusive $B$ meson decays made in the perturbative QCD approach, concentrating on the evolution of the $B$ meson wave function in $k_T$ factorization, radiative decays, polarizations in $VV$ modes, and new physics effect in $B\to \phi K_S$. 
Hsiang-nan Li