Anatomy of Top-Mode Extended Technicolor Model(Particles and Fields)

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概要

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• We analyze two versions of the extended technicolor (ETC) incorporating the top quark condensate via the flavor-universal coloron type topcolor SU(3)_1×SU(3)_2: A straightforward top-mode ETC having quarks and techniquarks assigned to a single (strong) SU(3)_1, and a "twisted model" with techniquarks carrying the weak SU(3)_2 while quarks the strong SU(3)_1. The straightforward model has the same ETC structure as that of Appelquist et al. without topcolor which we first analyze to find that it yields only too small ETC-induced mass for the third generation. In contrast, our model having topcolor takes the form of a version of the topcolor-assisted technicolor (TC2) after ETC breakings, which triggers the top quark condensate giving rise to a realistic top mass. However, techniquarks have the strong topcolor SU(3)_1 in addition to the already strong walking/conformal technicolor, which triggers the techniquark condensate at scale much higher than the weak scale, a disaster. We then consider a "twisted model" of TC2, though not an explicit ETC. We find a new feature that "ETC"-induced quark mass is enhanced to the realistic value by the large anomalous dimension γ_m≃2 of Nambu-Jona-Lasinio-type topcolor interactions. The result roughly reproduces the realistic quark masses. We further find a novel effect of the above large anomalous dimension γ_m≃2: The top-pion mass has a universal upper bound, m_<π_t><70GeV, in the generic TC2 model.

• 理論物理学刊行会の論文
• 2008-03-25

著者

• YAMAWAKI Koichi

  Department of Physics, Nagoya University

• Yamawaki Koichi

  Department Of Physics Kyoto University

• FUKANO Hidenori

  Department of Physics, Nagoya University

• Fukano Hidenori

  Department Of Physics Nagoya University

• YAMAWAKI Koichi

  Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University

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