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Littlest Higgs model predicts some extra particles beyond the Standard Model.Among them, an extra neutral gauge boson A_H is lightest and its mass could bea few hundred GeV. We study production and decay of A_H at future e^+ e^- inearcollider and compare them with those of Z' bosons in supersymmetric (SUSY) E_6models. We find that, if the extra gauge boson mass is smaller than \sqrt{s} ofthe linear collider, the forward-backward asymmetries of b- and c-quarks at theA_H pole differ significantly from those given by the Z' bosons, and are usefulto test the littlest Higgs model and SUSY E_6 models.Comment: 5 pages, 3 figures, version to appear in Phys.Rev.

Search for a light extra gauge boson in the littlest Higgs model at a linear collider