ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997, vol. 415, p. 445-451
First observation of the decay φ → η′(958) γ
The decay φ → η′γ has been observed by the CMD-2 detector at the e+e- collider VEPP-2M at Novosibirsk. Of 5.5 million produced φ's, six events of the φ → η′γ decay were selected with the expected background less than one event. The corresponding branching ratio is B(φ → η′γ) = 1.2+0.75-0.5 10-4. It is the first observation of this radiative decay. © 1997 Published by Elsevier Science B.V.