The process e+e→K+Kη has been studied in the center-of-mass energy range from 1.59 to 2.007 GeV using the data sample of 59.5 pb−1, collected with the CMD-3 detector at the VEPP-2000 e+e collider in 2011, 2012 and 2017. The K+Kη final state is found to be dominated by the contribution of the ϕ(1020)η intermediate state. The cross section of the process e+e→ϕ(1020)η has been measured with a systematic uncertainty of 5.1% on the base of 3009 ± 67 selected events. The obtained cross section has been used to calculate the contribution to the anomalous magnetic moment of the muon: aμ ϕη(E<1.8GeV)=(0.321±0.015stat±0.016syst)×10−10, aμ ϕη(E<2.0GeV)=(0.440±0.015stat±0.022syst)×10−10. From the cross section approximation the ϕ(1680) meson parameters have been determined with better statistical precision, than in previous studies.

Original languageEnglish
Article number134946
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 10 Nov 2019


  • E(+)E(-)
  • PAIR


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