Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-28
Phys.Rev.D80:071701,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 4 figs, to appear in PRD (Rapid Communication)
Scientific paper
10.1103/PhysRevD.80.071701
We examine various direct and indirect constraints on the lepton-specific two-Higgs doublet model and scrutinize the property of the Higgs bosons in the allowed parameter space. These constraints come from the precision electroweak data, the direct search for Higgs boson, the muon anomalous magnetic moment, as well as some theoretical consistency requirements. We find that in the allowed parameter space the CP-odd Higgs boson A is rather light (m_A < 30 GeV with 95% possibility), which is composed dominantly by the leptonic Higgs and decays dominantly into \tau^+ \tau^-; while the SM-like Higgs boson h (responsible largely for electroweak symmetry breaking) decays dominantly in the mode h->A A->4 \tau with a large decay width, which will make the Higgs discovery more difficult at the LHC. Whereas, this scenario predicts a branching ratio Br(Z->\tau^+ \tau^- A) ranging from 10^{-5} to 10^{-4}, which may be accessible at the the GigaZ option of the ILC.
Cao Junjie
Wan Peihua
Wu Lei
Yang Jin Min
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