Probing the gauge bosons Z′ and B′ from the littlest Higgs model in the high-energy linear e+e− colliders

The littlest Higgs (LH) model predicts the existence of the new gauge bosons Z′ and B′. We calculate the contributions of these new particles to the processes e+e−→f¯f with f=τ,μ,b or c and study the possibility of detecting these new particles via these processes in the future high-energy linear e+e− collider (LC) experiments with s=500GeV and £int=340fb−1. We find that, with reasonable values of the parameter preferred by the electroweak precision data, the possible signals of these new particles might be detected. The Z′ mass MZ′ can be explored up to 2.8 TeV via the process e+e−→b¯b for 0.3⩽c⩽0.5 and the B′ mass MB′ can be explored up to 1.26 TeV via the process e+e−→l¯l for 0.64⩽c′⩽0.73.