Constraints on leptophobic Z' models from electroweak experiments

Details Constraints on leptophobic Z' models from electroweak experiments Constraints on leptophobic Z' models from electroweak experiments

1998-05-25

arxiv.org/abs/hep-ph/9805447v2

Phys.Rev. D58 (1998) 115008

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.58.115008

We study the constraints from updated electroweak data on the three leptophobic Z' models, the ${\eta}$ model with an appropriate $U(1)'-U(1)_Y$ 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 $Z-Z'$ 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 $Z-Z'$ mixing parameter $\zeta$.

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