In U(1) extensions with a light Z', the Higgs decay h->Z'Z' strengthens bounds from ZZ* signal strength measurements beyond the total signal strength alone.
Precise prediction for the mass of the $W$ boson in gauged U(1) extensions of the standard model
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We present the one-loop radiative corrections to the muon decay in U(1)$_z$ extensions of the standard model. We compute the mass of the $W$ boson using those corrections and compare it to an approximation of the complete one-loop prediction implemented in automated computational tools. We point out that the truncation of the complete formulas become unreliable if the mass of the $Z'$ boson, corresponding to the new U(1)$_z$ gauge group is larger than about 1 TeV.
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Precision Higgs Constraints in U(1) Extensions of the Standard Model with a Light Z'-Boson
In U(1) extensions with a light Z', the Higgs decay h->Z'Z' strengthens bounds from ZZ* signal strength measurements beyond the total signal strength alone.