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We derive the leptonic neutral current in the simplest little Higgs model and compute the contribution of the model to the decay width Z → e + e −. Using the precision electroweak data we obtain a strong lower bound f ≥ 5.6 TeV at 95% C.L. on the characteristic energy scale of the model. It results in a lower bound for the new gauge bosons W ′± and Z ′ as(More)
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