2006/11/30 by Kingman Cheung, Jeonghyeon Song · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.76.035007
published as Phys.Rev.D76:035007,2007 · major modification considering the simplest little Higgs model with the mu term
arxiv created 2007/02/09 · openalex publication_date 2007/08/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The SU(3) simplest little Higgs model in its original framework without the so-called \ensuremathμ term inevitably involves a massless pseudoscalar boson \ensuremathη, which is problematic for b physics and the cosmological axion limit. With the \ensuremathμ term introduced by hand, the \ensuremathη boson acquires mass m_\ensuremathη\ensuremath∼\ensuremathμ, which can be lighter than half the Higgs boson mass in a large portion of the parameter space. In addition, the introduced \ensuremathμ term generates sizable coupling of H\mathrm\text\ensuremath-\ensuremathη\mathrm\text\ensuremath-\ensuremathη. The Higgs boson can dominantly decay into a pair of \ensuremathη's especially when mH is below the WW threshold. Another new decay channel of H\ensuremath→Z\ensuremathη can be dominant or compatible with H\ensuremath→W+W^\ensuremath- for mH above the Z\ensuremathη threshold. We show that the LEP bound on the Higgs boson mass is loosened to some extent due to this new H\ensuremath→\ensuremathη\ensuremathη decay channel as well as the reduced coupling of H\mathrm\text\ensuremath-Z\mathrm\text\ensuremath-Z. The Higgs boson mass bound falls to about 110 GeV for f=3--4 TeV. Since the \ensuremathη boson decays mainly into a bb pair, H\ensuremath→\ensuremathη\ensuremathη\ensuremath→4b and H\ensuremath→Z\ensuremathη\ensuremath→Zbb open up other interesting search channels in the pursuit of the Higgs boson in the future experiments. We discuss these issues.