Relative probabitity for the decay φ → ηγ
Kurdadze L. M., Lel'chuk M. Yu., Root N. I., Sidorov V. A., Chilinqarov A. G., Shvartis B. A., Eidel'man S.I.
The cross section for the reaction e+e -^ηγ in the vicinity of φ (1020) has been measured with the OLYa detector on the VEPP-2M storage ring. The relative probability found for the decay φ—*ηγ is Β (φ-+ηγ) = 0.9 ± 0.2%.