ar X iv : h ep - p h / 02 04 05 7 v 1 4 A pr 2 00 2 The dynamical models and the Z → bb̄ asymmetry
نویسندگان
چکیده
Motivated by the 3.2σ(1.4σ) deviations between the recent experimental value for AFB(Rb) and the standard model(SM) prediction, we examine the effect of new physics(NP) on the Zbb̄ couplings g L and g b R. First we focus our attention on the dynamical models. Then, using effective lagrangean techniques, we discuss the corrections of NP to g L and g b R. We find some kinds of NP might explain the recently experimental data about Rb and A b FB. However, the free parameters of these kinds of NP must be severely constrained. PACS number(s): 12.60Cn,12.60.Nz,13.38.Dg This work is supported by the National Natural Science Foundation of China(I9905004), the Excellent Youth Foundation of Henan Scientific Committee(9911), and Foundation of Henan Educational Committee. E-mail:[email protected]
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