Forward-backward asymmetry and a new interference-normalized observable I_FB can probe off-shell leptophilic Z_ℓ bosons at future e+e- colliders, with complementary reach from circular and linear machines.
de Blas et al., The CLIC Potential for New Physics, CERN Yellow Reports, Vol
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abstract
The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines the benefits of the clean environment of $e^+e^-$ colliders with operation at high centre-of-mass energies, allowing to probe scales beyond the reach of the Large Hadron Collider (LHC) for many scenarios of new physics. This places the CLIC project at a privileged spot in between the precision and energy frontiers, with capabilities that will significantly extend knowledge on both fronts at the end of the LHC era. In this report we review and revisit the potential of CLIC to search, directly and indirectly, for physics beyond the Standard Model.
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Requiring exotic Higgs decays to two or three light singlet scalars not to exceed the SM Higgs width yields cos θ < 0.12-0.13 for m_φ < 40 GeV, with predicted rate limits Γ(h→φφ) < 0.06 MeV and Γ(h→φφφ) < 5×10^{-6} MeV under stronger mixing bounds.
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Phenomenology of Leptophilic Gauge Interactions at Future $e^+e^-$ Colliders
Forward-backward asymmetry and a new interference-normalized observable I_FB can probe off-shell leptophilic Z_ℓ bosons at future e+e- colliders, with complementary reach from circular and linear machines.
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Constraints on a Light Singlet Scalar from Combined Exotic Higgs Decays
Requiring exotic Higgs decays to two or three light singlet scalars not to exceed the SM Higgs width yields cos θ < 0.12-0.13 for m_φ < 40 GeV, with predicted rate limits Γ(h→φφ) < 0.06 MeV and Γ(h→φφφ) < 5×10^{-6} MeV under stronger mixing bounds.