Lepton-Flavour Nonconservation and the Type of Neutrino Masses

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概要

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• The lepton-flavour nonconservation is studied in the left-right symmetric gauge theory with both Majorana and Dirac mass terms of neutrinos. The tree graphs with physical Higgs scalar exchange and the one-loop graphs with light (left-handed) and heavy (right-handed) gauge boson exchange contributing to u⇾eγ and μ⇾eee^^- are evaluated. The one-loop graphs with intermediate heave Majorana neutrinos are shown to give more important effects that those with light Majorana neutrinos. The latter contributions to the rare decay rates are negligibly small, independently of the value of η≡M^2_<W<L>>/M^2_<W<R>>, because of the strong suppression by powers of light neutrino masses m_<νL>. The former contributions are not directly related to m_<νL> but depend on η. They can lead to relatively large values of the rare decay rates, unless η is inhibitingly small. The predictions for the rates of lepton-flavour changing processes μ⇾eγ, μ⇾eee^^-, μN⇾eN, K_L⇾μe^^- and K^+⇾π^+μe^- in the present gauge model are compared with similar predictions in other types of gauge models with different types of neutrino masses.

• 理論物理学刊行会の論文
• 1982-05-25

著者

• Inami T

  Department Of Physics Chuo University

• INAMI Takeo

  Research Institute for Fundamental Phisics, Kyoto University

• Inami Takeo

  Institute Of Physics University Of Tokyo

• Inami Takeo

  Institute Of Physics College Of General Education University Of Tokyo

• LIM C.

  Institute of Physics, University of Tokyo

• Lim C

  Instrumentation Research Team Research Institute Of Industrial Science And Technology

• Lim C.s.

  Institute Of Physics University Of Tokyo

• Lim C.

  Institute Of Physics University Of Tokyo

• INAMI Takeo

  Yukawa Institute for Theoretical Physics, Kyoto University : the Grant-in-Aid for Scientific Research, Priority Area 231 "Infinite Analysis", Japan Ministry of Education

• INAMI Takeo

  Institute of Physics, University of Tokyo

• INAMI Takeo

  Research Institute for Fundamental Physics, Kyoto University

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