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

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 $\varphi (1020)\eta$ intermediate state. The cross section of the process $e^{+}{e}^{-}\to \varphi (1020)\eta$ 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: $a_{\mu }^{\varphi \eta }(E<1.8\mathrm{GeV})=(0.321\pm 0.015_{\mathrm{stat}}\pm 0.016_{\mathrm{syst}})\times 10^{-10}$, $a_{\mu }^{\varphi \eta }(E<2.0\mathrm{GeV})=(0.440\pm 0.015_{\mathrm{stat}}\pm 0.022_{\mathrm{syst}})\times 10^{-10}$. From the cross section approximation the $\varphi (1680)$ meson parameters have been determined with better statistical precision, than in previous studies.

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Cited by in corpus (7)

• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• A new evaluation of the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment and to $\mathbf{\alpha }({\mathbf{m}}_{\mathbf{Z}}^2)$
• The anomalous magnetic moment of the muon in the Standard Model: an update
• What can we learn about light-meson interactions at electron-positron colliders?
• Resonance contributions $\varphi (1020,1680)\to K\bar{K}$ for the three-body decays $B\to K\bar{K}h$
• Study of the process $e^{+}{e}^{-}\to \eta {\pi }^0\gamma$ in the energy range $\sqrt{s} = \mbox{1.05-2.00}$ GeV with the SND detector
• Study of $e^{+}{e}^{-}\to \eta \varphi$ via Initial State Radiation at Belle