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Ivanov, V.L.; Fedotovich, G.V.; Akhmetshin, R.R.; Amirkhanov, A.N.; Anisenkov, A.V.; Aulchenko, V.M.; Banzarov, V.Sh; Bashtovoy, N.S.; Berkaev, D.E.; Bondar, A.E.; Bragin, A.V.; Eidelman, S.I.; Epifanov, D.A.; Epshteyn, L.B.; Erofeev, A.L.; Gayazov, S.E.; Grebenuk, A.A.; Gribanov, S.S.; Grigoriev, D.N.; Ignatov, F.V.; Karpov, S.V.; Kasaev, A.S.; Kazanin, V.F.; Koop, I.A.; Korobov, A.A.; Kozyrev, A.N.; Kozyrev, E.A.; Krokovny, P.P.; Kuzmenko, A.E.; Kuzmin, A.S.; Logashenko, I.B.; Lukin, P.A.; Lysenko, A.P.; Mikhailov, K.Yu; Okhapkin, V.S.; Perevedentsev, E.A.; Pestov, Yu.N.; Popov, A.S.; Razuvaev, G.P.; Ruban, A.A.; Ryskulov, N.M.; Ryzhenenkov, A.E.; Semenov, A.V.; Shatunov, Yu.M.; Shebalin, V.E.; Shemyakin, D.N.; Shwartz, B.A.; Shwartz, D.B.; Sibidanov, A.L.; Solodov, E.P.; Timoshenko, M.V.; Titov, V.M.; Talyshev, A.A.; Tolmachev, S.S.; Vorobiov, A.I.; Yudin, Yu.V.
Physics letters. B, 11/2019, Volume: 798Journal Article
The process e+e−→K+K−η 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+K−η 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: aμϕη(E<1.8GeV)=(0.321±0.015stat±0.016syst)×10−10, aμϕη(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.
