New gauge bosons from the littlest Higgs model and the process e + e −

In the context of the littlest Higgs(LH) model, we study the process ee → tt̄. We find that the new gauge bosons ZH and BH can produce significant correction effects on this process, which can be further enhanced by the suitably polarized beams. In most of the parameter space preferred by the electroweak precision data, the absolute value of the relative correction parameter RBH is larger than 5%. As long as 1TeV ≤ MZH ≤ 1.5TeV and 0.3 ≤ c ≤ 0.5, the absolute value of the relative correction parameter RZH is larger than 5%. With reasonable values of the parameters of the LH model, the possible signals of the new gauge bosons BH and ZH can be detected via the process e e → tt̄ in the future LC experiments with the c.m. energy √ S = 800GeV . BH exchange and ZH exchange can generate significantly corrections to the forward-backward asymmetry AFB(tt̄) only in small part of the parameter space. ∗E-mail:[email protected]