An extension of two-Higgs-doublet model and the excesses of 750 GeV diphoton, muon g-2 and $h\to \mu \tau$

Abstract

In this paper we simultaneously explain the excesses of the 750 GeV diphoton, muon g-2 and $h\to \mu \tau$ in an extension of the two-Higgs-doublet model (2HDM) with additional vector-like fermions and a CP-odd scalar singlet ($P$) which is identified as the 750 GeV resonance. This 750 GeV resonance has a mixing with the CP-odd scalar ($A$) in 2HDM, which leads to a coupling between $P$ and the SM particles as well as a coupling between $A$ and the vector-like fermions. Such a mixing and couplings are strongly constrained by $\tau \to \mu \gamma$, muon g-2 and the 750 GeV diphoton data. We scan over the parameter space and find that such an extension can simultaneously account for the observed excesses of 750 GeV diphoton, muon g-2 and $h\to \mu \tau$. The 750 GeV resonance decays in exotic modes, such as $P\to hA$, $P\to HZ$, $P\to HA$ and $P\to W^{\pm }{H}^{\mp }$, and its width can be dozens of GeV and is sensitive to the mixing angle.

18 pages, 3 figures and references added

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• One loop contributions to neutral Higgs decay h-->mu tau
• A Flippon Related Singlet at the LHC II
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• Flavor-Changing Higgs Decays in Grand Unification with Minimal Flavor Violation
• Learning from the New Higgs-like Scalar before It Vanishes
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• Rare top-quark decays $t\to cg(g)$ in the aligned two-Higgs-doublet model
• The Observed Diphoton Excess in F-theory Inspired Heterotic String-Derived Model
• Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
• Exploring high-mass diphoton resonance without new colored states
• Positivity and unitarity constraints on dipole gluon distributions
• Hadron Correlations at Energies from GeV to TeV
• Implications of perturbative unitarity for scalar di-boson resonance searches at LHC