LHC ttγ and ttγγ data constrain electromagnetic and chromomagnetic dipole couplings of vector-like top quarks down to ~0.005 TeV^{-1} at 500 GeV mass, with weaker sensitivity at higher masses up to 2 TeV.
Christensen, Céline Degrande, Claude Duhr, and Benjamin Fuks
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A detector-level Monte Carlo analysis in the I(2+1)HDM reports S/B ≈ 9.8% and statistical significance S/√B = 4.93 at 4 ab⁻¹ for a benchmark two-component scalar DM point with soft dimuon invariant mass below m_Z.
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Constraints on Vector-Like Top Dipole Interactions from Top-Associated Photon Measurements at the LHC
LHC ttγ and ttγγ data constrain electromagnetic and chromomagnetic dipole couplings of vector-like top quarks down to ~0.005 TeV^{-1} at 500 GeV mass, with weaker sensitivity at higher masses up to 2 TeV.
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Soft-Dimuon Signature from Two-Component Scalar Dark Matter at the LHC
A detector-level Monte Carlo analysis in the I(2+1)HDM reports S/B ≈ 9.8% and statistical significance S/√B = 4.93 at 4 ab⁻¹ for a benchmark two-component scalar DM point with soft dimuon invariant mass below m_Z.
- Renormalization of mixing angles and computation of the hadronic $W$ decay widths