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Negative Vertex Contributions to Parameters S and T From Charged Pseudo-Goldstone Boson

Authors:	Zhen-Jun XIAO Ling-De WAN Gong-Ru LU Xue-Lei WANG Zhi-Hua YUAN

Institution:	1. Department of Physics, Henan Normal University, Xinxiang 453002, China; 2. Department of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Abstract:	We describe how to incorporate the one-loop vertex corrections on Zbb coming from the virtual charged pseudo-Goldstone bosons (PGB) P^± and P₈^± in one-generation technicolor model into the estimation for the value of Peskin-Takeuchi parameters S and T. We findthat the vertex contributions S_V and T_V are all negative and can cancel out the positiveoblique contributions Shad and Thad. NOW the value of S can be negative and T is also muchsmaller than the traditional estimation.

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