PROBING DYNAMICAL SYMMETRY-BREAKING USING TOP-QUARK

We report our study on probing dynamical symmetry breaking physics usi ng top quark. We assume (i)technicolor-like scenario for inducing W ma ss, and (ii)an effective 4-fermi interaction for inducing top mass. Wi th 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 int eraction (ii), as we vary the interaction (i). We find that the coupli ng is strong, G/4 pi similar to O(1). From the tree-level unitarity co nstraint it is suggested that M should be of the order of Lambda(TC) s imilar or equal to 1 similar to 2 TeV or less. We also study the consi stency with the present T parameter data, and obtain another upper bou nd for M. Using the obtained result, we estimate the non-standard-mode l correction to the polarized cross section for gamma gamma --> (t) ov er bar t at O(G). e.g. The correction exceeds 8% at root s = 1 TeV for the case N-TC = 3.