Future prospects for the determination of the Wilson coefficient C7γ′

We discuss the possibilities of assessing a non-zero C7γ′ from the direct and the indirect measurements of the photon polarization in the exclusive b→sγ(⁎) decays. We focus on three methods and explore the following three decay modes: B→K⁎(→KSπ0)γ, B→K1(→Kππ)γ, and B→K⁎(→Kπ)ℓ+ℓ−. By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of C7γ and C7γ′.