High Energy Neutrino Reactions and Physical Interpretation of the Weak Angle by the Theory of Weak Bosons
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概要
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Of the neutrino reactions, the quasi-elastic reactions (I) ν_l+n→p+l^-, ν^^-_l+p→n+l^+ and (II) ν^^-_l+N→Y+l^+ are studied in the theory of weak bosons. We assume that all form factors have the same analytic form and the same effective mass as that of the isovector part of the nucleon electro-magnetic form factor. In comparison with the results of the local (Fermi) interaction theory, the results of the present work on the weak boson theory are in better agreement with recent observations in the following points: A) The total cross sections for the neutrino reactions (I) and (II) become smaller than those of the local interaction theory. B) The ratios of the two reactions (I) and (II), with regard to the total cross sections also become smaller. C) As for the differential cross sections, the weak boson theory leads us to a larger ratio of the forward to the backward than that predicted by the local interaction theory. We also assume the existence of one or two kinds of weak bosons, W_0 (which couples with the ΔS=0 baryon currents) and W_1 (which couples with the ΔS=1 baryon currents), and suggest an explanation of the physical meaning of the weak angle θ in terms of these bosons. The experiments on the total cross section and the differential cross section for quasi-elastic neutrino reactions are in favour of our prediction, which may be considered as strong, although indirect, support for our assumption that weak bosons should exist.
- 理論物理学刊行会の論文
- 1968-09-25
著者
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Igarashi Masataka
Department Of Phvscis Tokai University
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Nakamura Seitaro
Department Of Physics Facult Of Science University Of Tokyo
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Nakamura Seitaro
Department of Applied Physics, Faculty of Science Tokyo Institute of Technology
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