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Abstract <p>We report a search for the rare Dalitz decays <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\omega\to\eta e^{+}e^{-}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m3--> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\rho\to\eta e^{+}e^{-}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m4--> </InlineEquation> using data from the CMD-3 detector at the VEPP-2000 <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(e^{+}e^{-}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m5--> </InlineEquation> collider. These decays probe the electromagnetic structure of vector mesons and test the Vector Dominance Model (VDM) in low-energy QCD. A blind analysis technique, combined with kinematic constraints and multivariate methods, suppresses dominant backgrounds from <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\omega\to 3\pi\)</EquationSource> <!--NuclPhys2560237Grigoriev-m6--> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\omega\to\eta\gamma\)</EquationSource> <!--NuclPhys2560237Grigoriev-m7--> </InlineEquation> following with photon conversions. Preliminary results for the 2013 (12 pb<InlineEquation ID="IEq8"> <EquationSource Format="TEX">\({}^{-1}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m8--> </InlineEquation>) and 2018 (21 pb<InlineEquation ID="IEq9"> <EquationSource Format="TEX">\({}^{-1}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m9--> </InlineEquation>) datasets yield background estimates of <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(N_{\text{bg}}=0.7\pm 0.4\)</EquationSource> <!--NuclPhys2560237Grigoriev-m10--> </InlineEquation> and <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(1.9\pm 0.6\)</EquationSource> <!--NuclPhys2560237Grigoriev-m11--> </InlineEquation> events, respectively. This study demonstrates sensitivity to branching ratios at the <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(10^{-6}\)</EquationSource> <!--NuclPhys2560237Grigoriev-m12--> </InlineEquation> level, establishing CMD-3 as a key instrument for precision tests of VDM predictions.</p>

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The Search of the Process \({e^{+}e^{-}\to(\omega,\rho)\to\eta e^{+}e^{-}}\) at 680–820 MeV c.m. Energy Range with the CMD-3 Detector

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • D. N. Grigoirev,
  • V. F. Kazanin,
  • V. L. Ivanov,
  • A. N. Narvatkina,
  • D. V. Shoukavy

摘要

Abstract

We report a search for the rare Dalitz decays \(\omega\to\eta e^{+}e^{-}\) and \(\rho\to\eta e^{+}e^{-}\) using data from the CMD-3 detector at the VEPP-2000 \(e^{+}e^{-}\) collider. These decays probe the electromagnetic structure of vector mesons and test the Vector Dominance Model (VDM) in low-energy QCD. A blind analysis technique, combined with kinematic constraints and multivariate methods, suppresses dominant backgrounds from \(\omega\to 3\pi\) and \(\omega\to\eta\gamma\) following with photon conversions. Preliminary results for the 2013 (12 pb \({}^{-1}\) ) and 2018 (21 pb \({}^{-1}\) ) datasets yield background estimates of \(N_{\text{bg}}=0.7\pm 0.4\) and \(1.9\pm 0.6\) events, respectively. This study demonstrates sensitivity to branching ratios at the \(10^{-6}\) level, establishing CMD-3 as a key instrument for precision tests of VDM predictions.