Muon g - 2 in the Littlest Higgs Model

In this paper the anomalous magneticdipole moment of muon in thelittlest Higgs (LH) model is studied at one-loop level. We discuss thedependence of the contributions on the global symmetry breaking scale f, mixing angles c and cˊ, and the Higgs triplet vacuum expectation value vˊ in the electroweak precision datapreferring ranges. We find that the LH model can give a relativelysmall, but non-negligible extra weak contribution to the muonanomalous magnetic moment and can reduce the deviation ofΔa_μ from 2.6σ for the SM to 2.5σ for the LH model.