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arXiv · 1906.08006

Study of the process $e^+e^-{\to}K^+K^-\eta$ 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·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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Abstract

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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V. L. Ivanov, G. V. Fedotovich, R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov, V. M. Aulchenko, V. Sh. Banzarov, N. S. Bashtovoy, 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. 2019-06-19. Study of the process $e^+e^-{\to}K^+K^-\eta$ with the CMD-3 detector at the VEPP-2000 collider. https://doi.org/10.1016/j.physletb.2019.134946

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