Non-Universal Correction To $Z\to b\bar{b}$ And Flavor Changing Neutral Current Couplings

Abstract

A non-universal interaction associated with top quark induces flavor changing neutral currents (FCNC) among light fermions. The size of the FCNC effect depends crucially on the dynamics of the fermion mass generation. In this paper, we study the effect of a non-universal interaction on $Zbb$, $Zbs$ {\it etc}, by using an effective lagrangian technique and assuming the quark mass matrices in the form of a generalized Fritzsch ansatz. We point out that if fitting $R_b$ to the LEP data within $1\sigma$, the induced FCNC couplings are very close to the experimental limits.

9 pages, TeX

References in corpus (5)

• Topcolor Assisted Technicolor
• Model-Independent Global Constraints on New Physics
• Implications of TeV Flavor Physics for the ΔI =1/2 Rule and the B-meson Semileptonic Branching Ratio
• Probing the Couplings of the Top Quark to Gauge Bosons
• Z -> b\bar{b} Versus Dynamical Electroweak Symmetry Breaking involving the Top Quark

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