η(') → π0γγ decays: Test of meson exchange models and searches of leptophobic B bosons

Abstract

We analyze the vector and scalar meson exchange contributions to the doubly radiative decays η(') → π0γγ and η' → ηγγ, and study the sensitivity of these decays to a leptophobic B boson in the sub-GeV mass range. Our results are relevant for studies of these decays at existing (A2, BESIII, KLOE-2) and forthcoming η/η'-factories, such as the JEF and REDTOP experiments.