Constraints on the mass and mixing of Z' bosons
J. Erler, P. Langacker, S. Munir, E. Rojas
TL;DR
This paper analyzes models extending the Standard Model with an extra U(1) gauge symmetry, using electroweak data to set limits on the Z' boson mass and mixing angle, finding lower mass bounds around 1 TeV and very small mixing angles.
Contribution
It provides the first comprehensive constraints on Z' boson mass and mixing angle from electroweak precision data across various extended models.
Findings
Lower bounds on M_Z' around 1 TeV
Z-Z' mixing angle constrained to very small values
Electroweak data effectively limits Z' properties
Abstract
We tested several models in which the Standard Model (SM) gauge group is extended by an additional U(1) gauge symmetry, against available electroweak precision data to impose limits on the mass of the neutral Z' boson, M_Z', predicted in all such models, and on the Z-Z' mixing angle, theta_ZZ', at 95% C.L. We found lower limits on M_Z' of order 1 TeV in most cases, while theta_ZZ' was found to be constrained to very small values.
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