Constraints on leptophobic Z' models from electroweak experiments

Abstract

We study the constraints from updated electroweak data on the three leptophobic Z' models, the $\eta$ model with an appropriate $U(1{)}^{\prime }-U(1{)}_Y$ kinetic mixing, a Z' model motivated by the flipped SU(5) \times U(1) unification, and the phenomenological Z' model of Agashe, Graesser, and Hinchliffe. The $Z-Z^{\prime }$ mixing effects are parametrized in terms of a positive contribution to the $T$ parameter, $T_{new}$, and the effective mass mixing parameter, $\bar{\xi }$. All the theoretical predictions for the $Z$ boson parameters, the $W$ boson mass and the observables in low-energy neutral current experiments are presented together with the standard model radiative corrections. The allowed region in the ($\bar{\xi },T_{new}$) plane is shown for the three models. The 95% CL lower limit on the heavier mass eigenstate $Z_2$ is given as a function of the effective $Z-Z^{\prime }$ mixing parameter $\zeta$.

LaTeX, 22pages, 2 figures, corrected some typos. Final version to appear in Phys. Rev. D

References in corpus (1)

• Implications of Generalized Z-Z' Mixing

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