ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2000, vol. 473, p. 337-342
New measurement of the rare decay φ → η'γ with CMD-2
A new measurement of the rare decay φ → η'γ performed with the CMD-2 detector at the VEPP-2M collider in Novosibirsk is described. Of the data sample corresponding to the integrated luminosity of 14.5 pb-1, twenty one events have been selected in the mode η' → π+ π- η, η → γγ. The following branching ratio was obtained: B(φ → η'γ) =(8.2-1.9/+2.1 ± 1.1) · 10-5. (C) 2000 Published by Elsevier Science B.V.