Probing dark particles indirectly at the CEPC

Abstract

When dark matter candidate and its parent particles are nearly degenerate, it would be difficult to probe them at the Large Hadron Collider directly. We propose to explore their quantum loop effects at the CEPC through the golden channel process $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$. We use a renormalizable toy model consisting of a new scalar and a fermion to describe new physics beyond the Standard Model. The new scalar and fermion are general multiplets of the $SU(2{)}_L\times U(1{)}_Y$ symmetry, and couple to the muon lepton through Yukawa interaction. We calculate their loop contributions to anomalous $\gamma {\mu }^{+}{\mu }^{-}$ and $Z{\mu }^{+}{\mu }^{-}$ couplings which can be applied to many new physics models. The prospects of their effects at the CEPC are also examined assuming a 0.002 accuracy in the cross section measurement.

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Cited by in corpus (10)

• Charged lepton flavor violating Higgs decays at future $e^{+}{e}^{-}$ colliders
• CEPC Precision of Electroweak Oblique Parameters and Weakly Interacting Dark Matter: the Fermionic Case
• Probing dark matter particles at CEPC
• Exploring Fermionic Dark Matter via Higgs Boson Precision Measurements at the Circular Electron Positron Collider
• CEPC Precision of Electroweak Oblique Parameters and Weakly Interacting Dark Matter: the Scalar Case
• Illuminating New Electroweak States at Hadron Colliders
• An indirect probe of higgsino world at the CEPC
• New Physics Search at the CEPC: a General Perspective
• Electroweak Multiplet Dark Matter at Future Lepton Colliders
• Enhanced $Z$ boson decays as a new probe of first-order electroweak phase transition at future lepton colliders