Factorization in Multibody Radiative B Decays

We study the radiative decays B→Kπγ and B→Kπe+e−, including both K∗ resonant contributions and non-resonant ones. We describe new soft pion theorems with which we compute certain non-resonant multibody amplitudes. We present results for CP asymmetry in B→Kπγ and for the forward-backward asymmetry in B→Kπe+e−.