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arxiv: 1906.08006 · v2 · pith:FCR42MQZ · submitted 2019-06-19 · hep-ex

Study of the process e^+e^-{to}K^+K^-η with the CMD-3 detector at the VEPP-2000 collider

V.L. Ivanov , G.V. Fedotovich , R.R. Akhmetshin , A.N. Amirkhanov , A.V. Anisenkov , V.M. Aulchenko , V.Sh. Banzarov , N.S. Bashtovoy
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D.E. Berkaev A.E. Bondar A.V. Bragin S.I. Eidelman D.A. Epifanov L.B. Epshteyn A.L. Erofeev S.E. Gayazov A.A. Grebenuk S.S. Gribanov D.N. Grigoriev F.V. Ignatov S.V. Karpov A.S. Kasaev V.F. Kazanin I.A. Koop A.A. Korobov A.N. Kozyrev E.A. Kozyrev P.P. Krokovny A.E. Kuzmenko A.S. Kuzmin I.B. Logashenko P.A. Lukin A.P. Lysenko K.Yu. Mikhailov V.S. Okhapkin E.A. Perevedentsev Yu.N. Pestov A.S. Popov G.P. Razuvaev A.A. Ruban N.M. Ryskulov A.E. Ryzhenenkov A.V. Semenov Yu.M. Shatunov V.E. Shebalin D.N. Shemyakin B.A. Shwartz D.B. Shwartz A.L. Sibidanov E.P. Solodov M.V. Timoshenko V.M. Titov A.A. Talyshev S.S. Tolmachev A.I. Vorobiov Yu.V. Yudin
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keywords beencrossprocesssectioncmd-3collidercontributiondetector
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The process $e^+e^-{\to}K^+K^-\eta$ 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 $K^+K^-\eta$ final state is found to be dominated by the contribution of the $\phi(1020)\eta$ intermediate state. The cross section of the process $e^+e^-{\to}\phi(1020)\eta$ has been measured with a systematic uncertainty of 5.1$\%$ on the base of 3009 $\pm$ 67 selected events. The obtained cross section has been used to calculate the contribution to the anomalous magnetic moment of the muon: $a_{\mu}^{\phi\eta}(E<1.8\, {\rm GeV})=(0.321 \pm 0.015_{\rm stat} \pm 0.016_{\rm syst}) \times 10^{-10}$, $a_{\mu}^{\phi\eta}(E<2.0\, {\rm GeV})=(0.440 \pm 0.015_{\rm stat} \pm 0.022_{\rm syst}) \times 10^{-10}$. From the cross section approximation the $\phi(1680)$ meson parameters have been determined with better statistical precision, than in previous studies.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The anomalous magnetic moment of the muon in the Standard Model: an update

    hep-ph 2025-05 accept novelty 5.0

    The updated SM prediction for the muon anomalous magnetic moment is 116592033(62)×10^{-11}, showing no tension with the experimental average of 38(63)×10^{-11}.