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Prog. Theor. Phys. Supplement No.123 (1996) pp. 151-161

Probing Dynamical Symmetry Breaking Using Top Quark

Takehiko Asaka, Yoshihiro Shobuda, Nobuhiro Maekawa,^* Takeo Moroi^** and Yukinari Sumino

Department of Physics, Tohoku University, Sendai 980-77, Japan
^*Department of Physics, Kyoto University, Kyoto 606-01, Japan
^**Theoretical Physics Group, Lawrence Berkeley Laboratory, Berkeley, USA

(Received December 18, 1995)

Abstract:

We report our study on probing dynamical symmetry breaking physics using top quark. We assume (i)technicolor-like scenario for inducing W mass, and (ii)an effective 4-fermi interaction for inducing top mass. With these minimal assumptions, we obtain lower bound for the strength G and the upper bound for the intrinsic mass scale M of the 4-fermi interaction (ii), as we vary the interaction (i). We find that the coupling is strong, G/4 π∼O(1). From the tree-level unitarity constraint it is suggested that M should be of the order of Λ _TC ≃1 ∼2 TeV or less. We also study the consistency with the present T parameter data, and obtain another upper bound for M. Using the obtained result, we estimate the non-standard-model correction to the polarized cross section for γγ→tt at O(G). E.g., the correction exceeds 8% at √s=1 TeV for the case N _TC = 3.

URL : http://ptp.ipap.jp/link?PTPS/123/151/
DOI : 10.1143/PTPS.123.151

[ Full Text PDF : FREE ACCESS (523K) ] Citation: Plain Text BiBTeX EndNote(RIS) RSS

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Citing Article(s) :

1. Progress of Theoretical Physics Supplement No.123 (1996) pp. 71-85 :

   Four-Fermion Dynamics and Fermion Masses

   Bob Holdom

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