摘要
In many extensions of the standard model, the Higgs sector often contains an additional pseudoscalar boson. A good example is the SU(3) simplest little Higgs model, which accommodates a light pseudoscalar boson η with quite different characteristics from those in other multi-Higgs-doublet models. We study various phenomenological signatures of the η at the CERN LHC. In particular, we calculate in details both production and decays in the Drell-Yan type channel qq̄→Z/Z′→hη, and in the associated production with a tt̄ pair, gg(qq̄)→tt̄η. We emphasize the τ+τ- decay mode of the η boson when its mass is below the bb̄ threshold. We show that tt̄η production is in fact large enough to give a sizable number of events while suppressing the backgrounds. We also comment on the direct gluon fusion process and the indirect decay from the heavy T quark (T→tη). © 2008 The American Physical Society.