Search for Phenomena of Partial Restoration of Chiral Symmetry in a High Momentum-Transfer Region

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概要

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• An experimental research trying to find precursory phenomena of the chiral transition in nuclei is going on by utilizing a 2.4 GeV Laser-Electron Photon beam at SPring-8. The photoproduction measurement of 2π^0 has been conducted for this purpose at a high momentum-transfer region, where the interaction of an incident photon with a nucleon in the nuclear target is expected to take place inside the nucleus effectively. A preliminary result of the 2π^0 photoproduction measurement is reported and a softening of the σ meson in nuclear medium is discussed as a candidate for the precursors. A plan for a η' measurement is also discussed in connection with the axial U(1) problem, which might be affected by partial restoration of chiral symmetry in nuclei.

• 理論物理学刊行会の論文
• 2003-07-18

著者

• Matsumura Toru

  Reseach Center For Nuclear Physics Osaka University

• Matsumura Toru

  Research Center For Nuclear Physics Osaka University

• SHIMIZU Hajime

  Laboratory of Nuclear Science, Tohoku University

• Shimizu Hajime

  Tohoku Univ. Sendai Jpn

• Shimizu Hajime

  Laboratory Of Nuclear Science Tohoku University

関連論文

• 2π Production Experiments at SPring-8(§6. Mesons in Nuclei,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)
• Search for Phenomena of Partial Restoration of Chiral Symmetry in a High Momentum-Transfer Region
• Observation of Narrow Structures in the P-P Analyzing Powerand Narrow Resonances

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