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Abstract <p>Searches for the massless dark photon in the decay <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(K^{+}\to\pi^{+}\pi^{0}\overline{\gamma}\)</EquationSource> <!--BPhysMGU2570247Sadovsky-m1--> </InlineEquation> are performed at the OKA detector exposed to 17.7 GeV/<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(c\)</EquationSource> <!--BPhysMGU2570247Sadovsky-m2--> </InlineEquation> RF separated secondary beam from the U-70 Proton Synchrotron. The missing mass analysis is performed to search for the decay channel with a stable zero mass dark photon in the final state. No signal is observed, and preliminary results are obtained for the upper limit at the 90<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\%\)</EquationSource> <!--BPhysMGU2570247Sadovsky-m3--> </InlineEquation> confidence level, based on a realistic matrix element of the process. The limit on the branching ratio is estimated as Br &lt; <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(2.3\times 10^{-6}\)</EquationSource> <!--BPhysMGU2570247Sadovsky-m4--> </InlineEquation>, which is currently the best limit for this decay channel.</p>

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A Search for the Dark Photon in the OKA Experiment

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. S. Sadovsky

摘要

Abstract

Searches for the massless dark photon in the decay \(K^{+}\to\pi^{+}\pi^{0}\overline{\gamma}\) are performed at the OKA detector exposed to 17.7 GeV/ \(c\) RF separated secondary beam from the U-70 Proton Synchrotron. The missing mass analysis is performed to search for the decay channel with a stable zero mass dark photon in the final state. No signal is observed, and preliminary results are obtained for the upper limit at the 90 \(\%\) confidence level, based on a realistic matrix element of the process. The limit on the branching ratio is estimated as Br < \(2.3\times 10^{-6}\) , which is currently the best limit for this decay channel.