2π Production Experiments at SPring-8(§6. Mesons in Nuclei,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)

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概要

• 論文の詳細を見る

• An experiment for 2π^0 photoproduction in nuclei is proposed by utilizing a multi-GeV Laser-Electron Photon beam at SPring-8. A backward γ-detector consisting of lead/scintillating fiber blocks is employed to detect 4γs at backward angles. The -γ-detector covers the polar angle from 30° to 100° with full azimuthal angles. The acceptance of the detector is estimated to be more than 0.3 for the σ meson with a mass of 500 MeV, produced in a high momentum transfer region of |t| > 1.5 GeV^2 at E_γ = 2.4 GeV. The γ-detector is capable of detecting some medium effects, especially of finding an enhancement in the π^0π^0 invariant mass distribution near the 2π threshold region. On the other hand, a new method is proposed for the test of the existence of the σ meson through the inverse process of σ → 2γat a very small momentum-transfer region.

• 素粒子論グループ 素粒子研究編集部の論文
• 2001-02-20

著者

• Matsumura Toru

  Reseach Center For Nuclear Physics Osaka University

• SHIMIZU Hajime

  Reseach Center for Nuclear Physics, Osaka University

• YORITA Tetsuhiko

  Reseach Center for Nuclear Physics, Osaka University

• Yorita Tetsuhiko

  Reseach Center For Nuclear Physics Osaka University

• Shimizu Hajime

  Reseach Center For Nuclear Physics Osaka University

関連論文

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