Quark Mass Hierarchy, FCNC and CP Violation in a Seesaw Model : Particles and Fields

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概要

• 論文の詳細を見る

• The seesaw model of quark masses is studied systematically, focusing on its developments. A framework in which the top quark mass is allowed to be of the order of the electroweak symmetry breaking scale, while the remaining light quarks have much smaller masses, due to the seesaw mechanism, is presented. The violation of the GIM mechanism is shown to be small and the tree level FCNC are suppressed naturally. In this model, there are many particles which could contribute to the FCNC in the one-loop level. The parameters of the model are constrained by using the experimental data on K^0-K^^-^0 mixing and ε_K. The rare K meson decays K_<L,S> → π^0νν^^- and K^+ → π^+νν^^- are also investigated in the model. In these processes the scalar operators (s^^-d) (ν^^-_τν_τ), which are derived from box diagrams in the model, play an important role due to the enhancement factor M_K/m_s in the matrix element <π|s^^-d|K>. It is emphasized that the K_L decay process through the scalar operator is not the CP-violating mode, so B(K_L → π^0νν^^-) remains non-zero even in the CP-conserved limit. The pion energy spectra for these processes are predicted.

• 理論物理学刊行会の論文
• 1999-03-25

著者

• TANIMOTO Morimitsu

  Department of Physics, Niigata University

• TANIMOTO Masayuki

  Yukawa Institute for Theoretical Physics, Kyoto University

• Parada Paulo

  Dep. De Fisica Universidade Da Beira Interior:cfif

• TANIMOTO Morimitu

  Department of Physics, Niigata University

• Tanimoto Morimitsu

  Science Education Laboratory Ehime University

• Morimitsu Tanimoto

  Science Education Laboratory Ehime University

• Tanimoto Morimitsu

  Cfif

• KIYO Yuichiro

  Deptartment of Physics, Hiroshima University

• MOROZUMI Takuya

  Deptartment of Physics, Hiroshima University

• REBELO Margarida

  IST

• Kiyo Y

  Tohoku Univ. Sendai Jpn

• Kiyo Yuichiro

  Deptartment Of Physics Hiroshima University

• Morozumi T

  Hiroshima Univ. Higashi Hiroshima Jpn

• Morozumi Takuya

  National Laboratory For High Energy Physics

• REBELO M.N.

  The Rockefeller University

• REBELO Margarida

  CFIF/IST

• TANIMOTO Morimitsu

  Faculty of Education, Ehime University

• Parada Paulo

  Dep. de Fisica, Universidade da Beira Interior:CFIF/IST

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