Observation of the phi to eta' gamma decay with four charged particles and photons in the final state

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178636Using 11.6 1/pb of data collected in the energy range 0.864-1.06 GeV by CMD-2 at VEPP-2M, the rare decay mode phi to eta' gamma was observed via the decay chain eta' to pi+pi- eta, eta to pi+pi-pi0 or eta to pi+pi- gamma. The following branching ratio was obtained: Br(phi to eta' gamma) = (4.9^{+2.2}_{-1.8} +- 0.6) \cdot 10^{-5}.11 pages, 5 figures, 1 tableHigh Energy Physics - ExperimentObservation of the phi to eta' gamma decay with four charged particles and photons in the final statetext