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Abstract <p>Processes of photo- and electroproduction of single pions on the proton, as well as the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\pi^{+}\pi^{-}p\)</EquationSource> <!--BPhysMGU2670025Golda-m1--> </InlineEquation> states, provide the most extensive body of information on the spectrum and structure of nucleon resonances (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(N^{*}\)</EquationSource> <!--BPhysMGU2670025Golda-m2--> </InlineEquation>). The electromagnetic transitions from the ground state of the nucleon to the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(N^{*}\)</EquationSource> <!--BPhysMGU2670025Golda-m3--> </InlineEquation> can shed light on the dynamics of the strong interaction responsible for generating the dominant portion of the visible mass in the Universe. Experiments conducted with the CLAS detector (Jefferson Lab, USA) have significantly expanded our understanding of nucleon resonance electro-excitation, with more than <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(150\,000\)</EquationSource> <!--BPhysMGU2670025Golda-m4--> </InlineEquation> data points of differential cross sections and various polarization observables measured. The paper presents selected results from the <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(N^{*}\)</EquationSource> <!--BPhysMGU2670025Golda-m5--> </InlineEquation> research programme at Jefferson Lab, as well as directions for future research with a focus on the MSU/JLAB collaboration.</p>

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Study of the Spectrum and Structure of Nucleon Resonances in the MSU/JLAB Collaboration

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • A. V. Golda,
  • E. L. Isupov,
  • A. A. Rusova,
  • V. B. Ryzhkov

摘要

Abstract

Processes of photo- and electroproduction of single pions on the proton, as well as the \(\pi^{+}\pi^{-}p\) states, provide the most extensive body of information on the spectrum and structure of nucleon resonances ( \(N^{*}\) ). The electromagnetic transitions from the ground state of the nucleon to the \(N^{*}\) can shed light on the dynamics of the strong interaction responsible for generating the dominant portion of the visible mass in the Universe. Experiments conducted with the CLAS detector (Jefferson Lab, USA) have significantly expanded our understanding of nucleon resonance electro-excitation, with more than \(150\,000\) data points of differential cross sections and various polarization observables measured. The paper presents selected results from the \(N^{*}\) research programme at Jefferson Lab, as well as directions for future research with a focus on the MSU/JLAB collaboration.