2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177883We investigate a new method to probe the helicity of the photon emitted in the b -> s gamma transition. The method relies on the observation of interference effects between two resonance contributions, B -> K*(K gamma) gamma and B -> eta_c(gamma gamma) K or B -> chi_c0(gamma gamma) K to the same final state K gamma gamma. Decays of the type B -> K_res(K gamma) gamma dominate the B -> K gamma gamma yield throughout most of the phase space, and may be accessible at current B meson facilities already.elsart, 11 pages, 4 figures; added comments on strong phase (final version Phys. Lett. B)High Energy Physics - Phenomenologytext