A Detailed Renormalization Group Analysis in Superstring Inspired Models : Particles and Fields

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概要

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• A renormalization group analysis is performed for a class of superstring inspired models, where the effects on the estimate of the low-energy parameters, sin^2θ_w,α and α_3 at M_w are examined which are due to (i) the two-loop contributions to the RGEs, (ii) the extra u(1)_E coupling and (iii) the threshold effects at M_c and M_l. The two-loop effects are significant if somewhat large α_i(M_c)≳0.1 are required at the one-loop level to reproduce the right values of the low-energy parameters. The effects of the U(1)_E coupling, however, turn to be rather negligible. The threshold effects at M are not so significant either, and actually hidden by the ambiguity of M_l. If small α_i(M)≲0.1 are taken, the low-energy parameters are rather sensitive against the deviation from some specific values of α_i(M_c)=α_u. On the other hand, in some models with M_l∼10^<10> GeV and certain matter contents, the right values of the low-energy parameters are obtained for a somewhat large region a_i(M_c)>0.1.

• 理論物理学刊行会の論文
• 1989-02-25

著者

• YAMAMOTO Katsuji

  Institute of Field Physics Department of Physics and Astronomy University of North Carolina

• Yamamoto K

  Department Of Physics Hiroshima University

• Nakamura Nobuhiro

  Department Of Electronics And Information Science Faculty Of Engineering And Design Kyoto Institute

• Umemura Isao

  Department Of Nuclear Engineering Faculty Of Engineering Kyoto University

• Umemura Isao

  Department Of Nuclear Engineering Kyoto University

• YAMAMOTO Katsuji

  Department of Nuclear Engineering Kyoto University

• Nakamura Nobuhiro

  Department Of Nuclear Engineering Kyoto University

• Nakamura Nobuhiro

  Department Of Applied Chemistry Faculty Of Engineering Kogakuin University.

• UEMURA Isao

  Department of Nuclear Engineering Kyoto University

• NAKAMURA Nobuhiro

  Department of Physics, Science University of Tokyo

• YAMAMOTO Katsuji

  Institute of Field Physics, Department of Physics and Astronomy University of North Carolina

• YAMAMOTO Kazuyoshi

  Department of Physics, Science University of Tokyo

• YAMAMOTO Kunio

  Institute of Physics, college of General Education Osa

• UMEMURA Isao

  Department of Nuclear Engineering, Faculty of Engineering Kyoto University

• YAMAMOTO Kazuhiro

  Uji Research Center, Yukawa Institute for Theoretical Physics Kyoto University

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