Properties of Axial-vector Mesons and Charmless B Decays: B -> VV, VA,   AA
  I introduce the properties of the light axial-vector mesons. The branching ratios, longitudinal fractions and direct CP asymmetries of the related charmless two-body B decays into final states involving two axial-vector mesons ($AA$) or one vector and one axial-vector meson ($VA$) are discussed within the framework of QCD factorization. 
Kwei-Chou Yang