Light pseudoscalar eta and H->eta eta decay in the simplest little Higgs mode

Details Light pseudoscalar eta and H->eta eta decay in the simplest little Higgs mode Light pseudoscalar eta and H->eta eta decay in the simplest little Higgs mode

2006-11-23

arxiv.org/abs/hep-ph/0611294v3

Phys.Rev.D76:035007,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

major modification considering the simplest little Higgs model with the mu term

Scientific paper

10.1103/PhysRevD.76.035007

The SU(3) simplest little Higgs model in its original framework without the so-called mu term inevitably involves a massless pseudoscalar boson eta, which is problematic for b-physics and cosmological axion limit. With the mu term introduced by hand, the eta boson acquires mass m_eta ~ mu, which can be lighter than half the Higgs boson mass in a large portion of the parameter space. In addition, the introduced mu term generates sizable coupling of H-eta-eta. The Higgs boson can dominantly decay into a pair of eta's especially when mH below the WW threshold. Another new decay channel of H->Z+eta can be dominant or compatible with H -> WW for mH above the Z+eta threshold. We show that the LEP bound on the Higgs boson mass is loosened to some extent due to this new H->eta eta decay channel as well as the reduced coupling of H-Z-Z. The Higgs boson mass bound falls to about 110 GeV for f=3-4 TeV. Since the eta boson decays mainly into a bb pair, H-> eta eta -> 4b and H-> Z eta -> Z bb open up other interesting search channels in the pursuit of the Higgs boson in the future experiments. We discuss on these issues.

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