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Production and decays of the light pseudoscalar boson $\eta$ at the LHC in the simplest little Higgs model

  • Cheung, Kingman
  • Song, Jeonghyeon
  • Tseng, Poyan
  • Yan, Qi-Shu
Published Article
Publication Date
Jul 08, 2008
Submission Date
Jun 27, 2008
DOI: 10.1103/PhysRevD.78.055015
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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 $\eta$ with quite different characteristics from those in other multi-Higgs-doublet models. We study various phenomenological signatures of the $\eta$ at the LHC. In particular, we calculate in details both production and decays in the Drell-Yan type channel $q \bar{q} \to Z/Z' \to h \eta$, and in the associated production with a $t\bar t$ pair, $gg (q\bar q) \to t \bar t \eta$. We emphasize the $\tau^+ \tau^-$ decay mode of the $\eta$ boson when its mass is below the $b\bar b$ threshold. We show that $t\bar t \eta$ 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 ($T \to t \eta$)

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