Heavy neutral pseudoscalar decays into gauge bosons in the Littlest Higgs Model

Abstract

We study two-body decays of a new neutral pseudoscalar into gauge bosons within the context of the Littlest Higgs model. Concretely, the ${\Phi }^P\to WW,VV,gg$ processes induced at the one-loop level, with $V=\gamma ,Z$, are considered. Since the branching ratios of the ${\Phi }^P\to VV$ decays result very suppressed, only the ${\Phi }^P\to WW,gg$ processes are thoroughly studied. The branching ratios for the ${\Phi }^P\to gg$ and ${\Phi }^P\to WW$ decays are of the order of $10^{-4}$ and $10^{-6}$, respectively, for $f$ around 2 TeV, which represents the global symmetry breaking scale of the theory. The production cross section of the ${\Phi }^P$ boson via gluon fusion at LHC is estimated.

Comments: 12 pages and 9 figures