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Abstract <p>In an experiment at the VEPP-2000 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{e}^{ + }}{{e}^{ - }}\)</EquationSource> <!--PhysPart2570153Achasov-m1--> </InlineEquation> collider, the processes <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({{e}^{ + }}{{e}^{ - }} \to n\bar {n}\)</EquationSource> <!--PhysPart2570153Achasov-m2--> </InlineEquation> and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({{e}^{ + }}{{e}^{ - }} \to p\bar {p}\)</EquationSource> <!--PhysPart2570153Achasov-m3--> </InlineEquation> were studied. The cross section of the <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({{e}^{ + }}{{e}^{ - }} \to p\bar {p}\)</EquationSource> <!--PhysPart2570153Achasov-m4--> </InlineEquation> process and the ratio <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\left| {{{{{G}_{{\text{E}}}}} \mathord{\left/ {\vphantom {{{{G}_{{\text{E}}}}} {{{G}_{{\text{M}}}}}}} \right. \kern-0em} {{{G}_{{\text{M}}}}}}} \right|\)</EquationSource> <!--PhysPart2570153Achasov-m5--> </InlineEquation> of electric and magnetic formfactors of proton and neutron were measured near the nucleon threshold with the SND detector. The preliminary value of the <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\left| {{{{{G}_{{\text{E}}}}} \mathord{\left/ {\vphantom {{{{G}_{{\text{E}}}}} {{{G}_{{\text{M}}}}}}} \right. \kern-0em} {{{G}_{{\text{M}}}}}}} \right|\)</EquationSource> <!--PhysPart2570153Achasov-m6--> </InlineEquation> ratio for the neutron is consistent with unity, while for the proton this value varies in the range of 1.2 to 1.8.</p>

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Experimental Study of Electromagnetic Timelike Form Factors of Neutron and Proton at the VEPP-2000 e+e– Collider with the SND Detector

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • M. N. Achasov,
  • A. Yu. Barnyakov,
  • K. I. Beloborodov,
  • A. V. Berdyugin,
  • D. E. Berkaev,
  • A. G. Bogdanchikov,
  • A. A. Botov,
  • V. S. Denisova,
  • T. V. Dimova,
  • V. P. Druzhinin,
  • V. N. Zhabin,
  • V. V. Zhulanov,
  • I. M. Zemlyansky,
  • L. V. Kardapoltsev,
  • A. A. Kattsin,
  • D. P. Kovrizhin,
  • I. A. Koop,
  • A. A. Korol,
  • A. S. Kupich,
  • A. P. Kryukov,
  • N. A. Melnikova,
  • N. Yu. Muchnoy,
  • A. E. Obrazovsky,
  • I. V. Ovtin,
  • E. V. Pakhtusova,
  • E. A. Perevedentsev,
  • K. V. Pugachev,
  • Yu. A. Rogovsky,
  • S. I. Serednyakov,
  • Z. K. Silagadze,
  • I. K. Surin,
  • M. V. Timoshenko,
  • Yu. V. Usov,
  • L. B. Fomin,
  • A. G. Kharlamov,
  • E. A. Eminov,
  • D. A. Shtol

摘要

Abstract

In an experiment at the VEPP-2000 \({{e}^{ + }}{{e}^{ - }}\) collider, the processes \({{e}^{ + }}{{e}^{ - }} \to n\bar {n}\) and \({{e}^{ + }}{{e}^{ - }} \to p\bar {p}\) were studied. The cross section of the \({{e}^{ + }}{{e}^{ - }} \to p\bar {p}\) process and the ratio \(\left| {{{{{G}_{{\text{E}}}}} \mathord{\left/ {\vphantom {{{{G}_{{\text{E}}}}} {{{G}_{{\text{M}}}}}}} \right. \kern-0em} {{{G}_{{\text{M}}}}}}} \right|\) of electric and magnetic formfactors of proton and neutron were measured near the nucleon threshold with the SND detector. The preliminary value of the \(\left| {{{{{G}_{{\text{E}}}}} \mathord{\left/ {\vphantom {{{{G}_{{\text{E}}}}} {{{G}_{{\text{M}}}}}}} \right. \kern-0em} {{{G}_{{\text{M}}}}}}} \right|\) ratio for the neutron is consistent with unity, while for the proton this value varies in the range of 1.2 to 1.8.