Light σ-Meson Production in Excited Υ Decay Processes I : Analyses(§3. ππ Production Processes,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)

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概要

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• We analyze the ππ production amplitudes in the excited Υ decay processes, Υ(2S) →Υ(1S)π^+π-,Υ(3S) →Υ(1S)π^+π^- andΥ(3S) →Υ(2S)π^+π^-, and the ππ and KK^^- production amplitudes in the charmoniurn decay processes, Ψ(2S) → J/Ψπ^+π^- and J/Ψ→ φπ^+π^-, φK^+K^-. The amplitudes are parametrized by the sum of Breit-Wigner amplitudes for the σ, and the other relevant particles and of the direct 2π-production amplitude, following the VMW method. All the ππ (and KK^^-) invariant mass spectra are reproduced well with the σ Breit-Wigner amplitude by using the common parameters, m_σ = 526^<+48>_<-37>MeV and Γ_σ = 301^<+145>_<-100>MeV, which is almost consistent with the values obtained in our previous 100 phase shift analyses. This strongly suggests the existence of light σ-meson.

• 2001-02-20

著者

• ISHIDA Shin

  Atomic Energy Research Institute, College of Science and Technology, Nihon University

• ISHIDA Muneyuki

  Department of Physics, Tokyo Institute of Technology

• KOMADA Toshihiko

  Atomic Energy Research Institute, College of Science and Technology Nihon University

• Ishida Muneyuki

  Department Of Physics School Of Science And Engineering Meisei University

• Komada Toshihiko

  Department Of Engineering Science Junior College Funabashi Campus Nihon University

• Ishida S

  Research Institute Of Science And Technology College Of Science And Technology Nihon University

• ISHIDA Shin

  Research Institute of Science and Technology, College of Science and Technology, Nihon University

• Ishida M

  Tokyo Inst. Technol. Tokyo Jpn

• Ishida Shin

  Atomic Energy Research Institute College Of Science And Technolgy Nihon University

• KOMADA Toshihiko

  Department of Engineering Science, Junior College Funabashi Campus, Nihon University

• ISHIDA Shin

  Department of Physics and Atomic Energy Research Institute College of Science and Technology, Nihon University

• ISHIDA Shin

  College of Science & Technology, Nihon University Tokyo

• ISHIDA Shin

  Atomic Energy Research Institute, College of Science and Technology Nihon University

• ISHIDA Shin

  Atomic Energy Research Institute, College of Scinence and Technology Nihon University

• ISHIDA Muneyuki

  Department of Physics,University of Tokyo

• Komada Toshihiko

  Atomic Energy Research Institute, College of Science and Technology, Nihon University

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