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 Φ P → W W, V V, gg processes induced at the one-loop level, with V = γ, Z, are considered. Since the branching ratios of the Φ P → V V decays result very suppressed, only the Φ P → W W, gg processes are thoroughly studied. The branching ratios for the Φ P → gg and Φ P → W W 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 Φ P boson via gluon fusion at LHC is estimated.

Phenomenological implications of the new Littlest Higgs model with T-parity

“…On the other hand, the Goldstone sector includes the T-even physical Higgs and the would-be Goldstone bosons absorbed by the SM gauge bosons, together with extra T-odd scalars: the would-be Goldstone bosons eaten by the heavy gauge bosons and a physical complex triplet. The Little Higgs (with and without T-parity) phenomenology has been extensively explored [12][13][14][15][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], also providing new sources of quark and lepton flavor violating processes [33][34][35][36][37][38][39][40][41][42][43][44][45][46] and neutrino mass generation [47][48][49][50][51][52][53]. However, the LHT has been shown to suffer from pathologies in the fermionic sector.…”