New Parameterization in Muon Decay and the Type of Emitted Neutrino(Particles and Fields)
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概要
- 論文の詳細を見る
Normal muon decay, μ^+→e^+ν_e<ν_μ>^^^-, is studied as a tool to discriminate between the Dirac and Majorana types of neutrinos and to survey the structure of the weak interaction. It is assumed that massive neutrinos mix with one another and that the interaction Hamiltonian consists of the V-A and V+A charged currents. A new set of parameters used in place of the Michel parameters is proposed for the positron distribution. Explicit forms of these new parameters are obtained by assuming that the masses are less than 10eV for light neutrinos and sufficiently large for heavy Majorana neutrinos, which are not emitted in the muon decay. It is shown that a possible method to discriminate between the Dirac and Majorana cases is to use a characterization given by the χ^2 fitting of their spectra. It is also confirmed that the theoretical predictions in the Majorana neutrino case are almost the same as those obtained from the standard model. Indeed, their differences cannot be distinguished within the present experimental precision.
- 理論物理学刊行会の論文
- 2005-10-25
著者
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西浦 宏幸
大阪工大情報
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西浦 宏幸
阪大・教養
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Doi M
Osaka University Of Pharmaceutical Sciences
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Doi Masaru
Osaka University Of Pharmaceutical Sciences
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Doi Masaru
Osaka College Of Pharmacy
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NISHIURA Hiroyuki
Faculty of Information Science and Technology
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NISHIURA Hiroyuki
Department of General Education
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KOTANI Tsuneyuki
Institute of Physics, College of General Education
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NISHIURA Hiroyuki
Research Institute for Fundamental Physics Kyoto University
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Doi M
Department Of Computational Science And Engineering Nagoya University
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NISHIURA Hiroyuki
College of General Education, Osaka University
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