Measurement of $\varphi$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider

Abstract

The $\varphi$(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance ($\varphi \to K^{+}{K}^{-},K_L^0{K}_S^0,{\pi }^{+}{\pi }^{-}{\pi }^0,\eta \gamma$) studied with the CMD-2 detector at the VEPP-2M $e^{+}{e}^{-}$ collider. The following value has been obtained: $\Gamma (\varphi \to e^{+}{e}^{-})=1.235\pm 0.006\pm 0.022$ keV. The $\varphi (1020)$ meson parameters in four main decay channels have been also recalculated: $B(\varphi \to K^{+}{K}^{-})=0.493\pm 0.003\pm 0.007$, $B(\varphi \to K_L{K}_S)=0.336\pm 0.002\pm 0.006$, $B(\varphi \to {\pi }^{+}{\pi }^{-}{\pi }^0)=0.155\pm 0.002\pm 0.005$, $B(\varphi \to \eta \gamma )=0.0138\pm 0.0002\pm 0.0002$.

arXiv comment14 pages, 3 figures

References in corpus (4)

• Study of the Processes e+ e- --> eta gamma, e+ e- --> pi0 gamma --> 3 gamma in the c.m. Energy Range 600--1380 MeV at CMD-2
• Measurement of e+e- -> phi -> K+K- cross section with the CMD-2 detector at VEPP-2M Collider
• Measurement of the $\varphi$ meson parameters with CMD-2 detector at VEPP-2M Collider
• Direct measurement of the phi(1020) leptonic branching ratio

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• Light Resonances and the Low-$q^2$ Bin of $R_{K^{\ast }}$
• Study of the process $e^{+}{e}^{-}\to K_S^0{K}_L^0$ in the center-of-mass energy range 1004--1060 MeV with the CMD-3 detector at the VEPP-2000 $e^{+}{e}^{-}$ collider
• Constraints on Axion couplings from the CDEX-1 experiment at the China Jinping Underground Laboratory
• Cross sections for the reactions $e^{+}{e}^{-}\to K_S^0{K}_L^0{\pi }^0$, $K_S^0{K}_L^0\eta$, and $K_S^0{K}_L^0{\pi }^0{\pi }^0$ from events with initial-state radiation
• Resonance contributions $\varphi (1020,1680)\to K\bar{K}$ for the three-body decays $B\to K\bar{K}h$
• Production of ${\pi }^0{\rho }^0$ pair in electron-positron annihilation in the Nambu-Jona-Lasinio model
• Measurements of the branching fraction ratio $\mathcal{B}(\varphi \to {\mu }^{+}{\mu }^{-})/\mathcal{B}(\varphi \to e^{+}{e}^{-})$ with charm meson decays