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Structure of N^*(1535) and Δ(1232) with Electromagnetic Probe

Research Project

Project/Area Number 12640273
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionOsaka University

Principal Investigator

SATO Toru  Osaka University, Graduate School of Science, Department of Physics, Associate Professor, 大学院・理学研究科・物理学専攻, 助教授 (10135650)

Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
KeywordsNucleon Resonance / Electron Scattering / Dion Production / Delta Resonance / ニュートリノ反応 / 核子共嗚
Research Abstract

An important challenge in nuclear research is to understand the hadron structure within QCD. One of the approach for pursuing this research is the study of the electromagnetic transition form factors of nucleon resonances. The purpose of this project is to extract the transition form factors. of Δ_<33> and N^*_<S11> resonances from the data of the electroproduction of meson.
In this work we developed a dynamical reaction model on the electroproduction of mesons form the interaction Hamiltonian of meson and baryon with the method of unitary transformation. The predicted cross sections of the pion electropruduction were found to describe very well the extensive data from Jlab, Mainz and MIT-Bates.
The results of our work are summarized as follows.
1. Magnetic dipole(M1) form factor of NΔ transition
The long standing discrepancy between empirically obtained M1 form factor and the prediction of quark models and also the very soft momentum dependence of the form factor were explained by the modification of the NΔ from factor due to the non-resonant rescattering mechanism.
2. Electric quadrupole(E2,C2) form factor of NΔ transition
The E2 and C2 form factors, which indicate the deformation of nucleon and delta, were shown to exist. In the high momentum transfer region the E1/M1 ratio was far small compared with the pQCD prediction. In the low momentum transfer region, we predicted a large contribution from the pion current. Those results have motivated proposal of new experiments.
In the S_<11> region, we have developed effective Hamiltonian to describe two-pion prodo ion processes, and developed a numerical method to overcome difficulties due to the three-body scattering state using Wick-rotation.
In summary we have shown the importance of dynamical approach to extract information on the nucleon resonance from the data of electroweak reactions.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] T.Sato: "Dynamical study of the Δexcitation in N (e,e'π) reactions"Physical Review C. 63・5. 055201-1-055201-13 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Sato: "Dynamical study of nuclear resonances in πN and γπ reactions"Nuclear Physics. A684. 26C-34C (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Nakamura: "Neutrino reactions on the deuteron"Physical Review C. 63・3. 034617-1-034617-18 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Sato: "Nuclear Physics with Electron Beams"Journal of Plasma and Fusion Resarch. 77・11. 1122-1127 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Nakamura: "Neutrino-deuteron reactions at solar neutrino energies"Nuclear Physics. A707. 561-576 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.-S.H.Lee: "Dynamical model of electroweak pion production reaction"Few-Body Systems Supplement. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Sato and T.-S. H. Lee: "Dynamical study of the Δ excitation in N(e, e^1π)) reactions"Physical Review. C63, 055201. 1-13 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Sato: "Dynamical study of nucleon resonances in πN and γN reactions"Nuclear Physics. A684. 26c-34c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Nakamura, T. Sato, V. Gudkov and K. Kubodera: "Neutrino reactions on the deuteron"Physical Review. C63, 034617. 1-18 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Sato: "Nuclear Physics with electron beam"Jour. of Plasma and Fusion Research. 77. 1122-1127 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Nakamura, T. Sato, S. Ando, T.-S. Park, F. Myhrer, V. Gudkov and K. Kubodera: "Neutrino-deuteron reactions at solar neutrino energies"Nuclear Physics. A707. 561-576 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. -S. H. Lee and T. Sato: "Dynamical model of electroweak pion production reactions"Few-Body Systems, Suppi.. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T, -S.H.Lee, T.Sato: "Dynamical Model of Electroweak Pion Production Deactions"Few-Body Systems Suppl.. (in print).

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Sato: "Electromagnetic production of pion & in the resonance region -theoretical aspects-"Proc. of Baryon2002. (in print).

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Sato: "Pion electroproduction on the Δ_<33> resonance region"Proc. of International Baldin Seminor. (in print).

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Nakamura, T.Sato, V.Gudkov, K.Kubodera: "Neutrino reactions on the deuteron"Phys. Rev.. C63. 0346M1-0346M18 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Sato, T.-S.H.Lee: "Dynamical Study of the Δ excitation in Nle, e'ttlreaction"Physical Review C. 63・5. 055201 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.-S.H.Lee, T.Sato: "Dynamical Study of the Δ excitation with Nle, e'ttlveaction"Nuclear Physics. A684. 327C (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.sato: "Dynamical study of nucleonresonauces in πN and γN reactions"Nuclear Physics. A684. 26C (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Sato: "Nuclear Physics with Electron Beams"Journal of Plasma and Fusion Research. 77・11. 1122 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Sato: "Pion Photo and Electro production in Dynamical Hodel"Proceedings of the physicals of Excited Nuclear. 75 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Sato: "Dynamical study of the △ excitatiou in Nle,e'π, Reactions"Physical Review. C (印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sato: "Dynamical study of Δ and N* in π N and rN reactions"Nuclear Physics. A (印刷中). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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