K_<l3> Decays and (1,8) + (8,1) Symmetry Breaking

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概要

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• Effects of (1,8) + (8,1) symmetry breaking on K_<l3> form factors are studied in the frame of soft-pion approach and in terms of the generalized σ models. It is shown that the soft-pion theorem for K_<l3> decays given by Weinstein in the presence of (3,3^*) + (3^*,3) breaking remains unchanged when the (1,8) + (8,1) symmetry breaking is added. It is further shown that, irrespective of whether massive gauge fields are introduced or not, the generalized σ models give too smooth off-shell extrapolation of the amplitudes to reproduce the present experimental values of the parameters ξ(0) and λ_+. As a result, it seems that either the tree approximation (the effective Lagrangian approach) or the approximate chiral SU(2)×SU(2) symmetry must be abandoned. However if a larger value for λ_+ is given by future experi-ments, the large negative ξ(0) will naturally be understood in this scheme.

• 理論物理学刊行会の論文
• 1973-04-25

著者

• Uchida Tomiyoshi

  Department Of Physics Nagoya University

• Suzuki Tsuneo

  Department Of Forensic Medicine Yamagata University School Of Medicine

• SUZUKI Tsuneo

  Department of Physics, Kanazawa University

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