Decoupling or nondecoupling: is that the $R_b$ question?

Details Decoupling or nondecoupling: is that the $R_b$ question? Decoupling or nondecoupling: is that the $R_b$ question?

1996-03-04

arxiv.org/abs/hep-ph/9603221v2

Phys.Rev. D54 (1996) 1176-1181

Physics

High Energy Physics

High Energy Physics - Phenomenology

Prompted by a wrong statement originally made about hep-ph/9602438, the abstract, final note and acknowledgments have been cha

Scientific paper

10.1103/PhysRevD.54.1176

The top quark is well known for the nondecoupling effects it implies in $\rho$ and $R_b$. The recent experimental $R_b$ data exhibits a disagreement with the SM prediction at more than the $3 \sigma$ level. It is tempting to explore whether this might be due to nondecoupling New Physics effects, opposite to those of the top. We investigate this issue in the context of models with an extra family of right or left handed, singlet or doublet quarks. It is shown that, contrary to what one might naively expect, the nondecoupling properties of a mirror $t^\prime$ do not have an impact on $R_b$, due to a conspiracy of the mixing angles, imposed by the requirement that there be no $b$ - $b^\prime$ mixing. Our analysis agrees with an analysis performed independently, which includes this model as a particular case.

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