Abstract <p>We observed <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="70" /> </InlineMediaObject> <EquationSource Format="TEX">\(2403 \pm 98\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m1--> </InlineEquation> events of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="157" /> </InlineMediaObject> <EquationSource Format="TEX">\({{\pi }^{ - }} + Be \to \phi {{\pi }^{0}} + A{\text{*}}\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m2--> </InlineEquation> reaction collected in exposition of the VES setup Be target by <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq3.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="71" /> </InlineMediaObject> <EquationSource Format="TEX">\(2.5 \times {{10}^{{11}}}\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m3--> </InlineEquation> <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">\({{\pi }^{ - }}\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m4--> </InlineEquation>-mesons with the 29 GeV momentum. A –<InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">\(\phi {{\pi }^{0}}\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m5--> </InlineEquation> production in a vector state is mostly observed with the recoil <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="59" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta (1232)\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m6--> </InlineEquation> isobar in a process with <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq7.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\pi \)</EquationSource> <!--PhysPNLt2470196Dorofeev-m7--> </InlineEquation> exchange dominance. The <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11497_2025_10018_Article_IEq8.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">\(\phi {{\pi }^{0}}\)</EquationSource> <!--PhysPNLt2470196Dorofeev-m8--> </InlineEquation> mass spectrum has a complicated shape.</p>

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Study of the ϕπ0-System Production in the Charge Exchange Reaction of the 29 GeV Pion Beam with the Berrilium Target of the VES Setup

  • V. Dorofeev,
  • V. G. Gotman,
  • A. V. Ivashin,
  • I. A. Kachaev,
  • Yu. A. Khokhlov,
  • M. S. Kholodenko,
  • V. I. Lisin,
  • V. D. Matveev,
  • E. V. Nazarov,
  • A. N. Plekhanov,
  • D. I. Ryabchikov,
  • A. A. Shumakov,
  • V. P. Sugonyaev,
  • A. M. Zaitsev

摘要

Abstract

We observed \(2403 \pm 98\) events of \({{\pi }^{ - }} + Be \to \phi {{\pi }^{0}} + A{\text{*}}\) reaction collected in exposition of the VES setup Be target by \(2.5 \times {{10}^{{11}}}\) \({{\pi }^{ - }}\) -mesons with the 29 GeV momentum. A – \(\phi {{\pi }^{0}}\) production in a vector state is mostly observed with the recoil \(\Delta (1232)\) isobar in a process with \(\pi \) exchange dominance. The \(\phi {{\pi }^{0}}\) mass spectrum has a complicated shape.