Study of the $\rho$ and $\omega$ meson decays into pseudoscalar meson and $e^{+}{e}^{-}$ pair with the CMD-2 detector

Abstract

Using 3.3 pb${}^{-1}$ of data collected with the CMD-2 detector in the 720 -- 840 MeV c.m. energy range, the branching fraction of the conversion decay $\omega \to {\pi }^0{e}^{+}{e}^{-}$ has been measured: $\mathcal{B}(\omega \to {\pi }^0{e}^{+}{e}^{-})=(8.19\pm 0.71\pm 0.62)\cdot 10^{-4}$. The upper limits for the branching fractions of the following conversion decays have been obtained at the 90% confidence level: $\mathcal{B}(\rho \to {\pi }^0{e}^{+}{e}^{-})<1.6\cdot 10^{-5}$, $\mathcal{B}(\rho \to \eta e^{+}{e}^{-})<0.7\cdot 10^{-5}$ and $\mathcal{B}(\omega \to \eta e^{+}{e}^{-})<1.1\cdot 10^{-5}$.

arXiv comment17 pages, 5 figures

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• Reanalysis of Hadronic Cross Section Measurements at CMD-2
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• Unified dispersive approach to real and virtual photon-photon scattering at low energy
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• Holographic QCD Integrated back to Hidden Local Symmetry
• Reaction of electron-positron to omega and pi mesons and rho(1450) and rho(1700) mesons in quark model
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• QCD analysis of electromagnetic Dalitz decays $J/\psi \to {\eta }^{(\prime )}{\ell }^{+}{\ell }^{-}$
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