Improved Constraints on Z' Bosons from Electroweak Precision Data

Details Improved Constraints on Z' Bosons from Electroweak Precision Data Improved Constraints on Z' Bosons from Electroweak Precision Data

2009-06-12

arxiv.org/abs/0906.2435v3

JHEP 0908:017,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 10 figures, final version as it will appear in Journal (JHEP)

Scientific paper

10.1088/1126-6708/2009/08/017

We analyze various models with an extra U(1) gauge symmetry in addition to the Standard Model (SM) gauge group at low energies, and 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'. The precision electroweak data strongly constrain theta_ZZ' to very small values and for most models we find lower limits on M_Z' of order 1 TeV. In one case we obtain a somewhat better fit than in the SM (although this is only marginally statistically significant) and here we find a weak upper limit at the 90% C.L.

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