Unitarity in Gauge Symmetry Breaking on an Orbifold

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概要

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• We study the unitarity bounds of scattering amplitudes in extra-dimensional gauge theory, in which the gauge symmetry is broken by the boundary conditions. The evaluation of the amplitude of the diagram including four massive gauge bosons in the external lines shows that the asymptotic power behavior of the amplitude is canceled. The calculation is carried out with the 5-dimensional standard model and the SU(5) grand unified theory, whose 5th dimensional coordinate is compactified on S^1/Z_2. The gauge theories broken through the orbifolding preserve unitarity at high energies, similarly to the broken gauge theories in which the gauge bosons acquire masses through the Higgs mechanism. We show that the contributions of the Kaluza-Klein states play a crucial role in conserving the unitarity.

• 理論物理学刊行会の論文
• 2003-05-25

著者

• Haba Naoyuki

  Faculty Of Engineering Mie University:(present Address) Department Of Physics Nagoya University

• Haba Naoyuki

  Faculty Of Engineering Mie University

• Abe Yoshikazu

  Faculty Of Engineering Mie University

• KOBAYASHI Ken-Ichiro

  Institute for Nuclear Study, University of Tokyo

• HlGASHIDE Yoshihiro

  Faculty of Engineering, Mie University

• KOBAYASHI Kenzo

  Faculty of Engineering, Mie University

• MATSUNAGA Mamoru

  Faculty of Engineering, Mie University

• Kobayashi K

  Faculty Of Engineering Mie University

• Matsunaga Mamoru

  Faculty Of Engineering Mie University

• Hlgashide Yoshihiro

  Faculty Of Engineering Mie University

• Haba Naoya

  Faculty of Engineering, Mie University

• Higashide Yoshihiro

  Faculty of Engineering, Mie University

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