Abstract
Various types of electroweak-interacting particles, which have non-trivial charges under the SU(2) L × U(1) Y gauge symmetry, appear in various extensions of the Standard Model. These particles are good targets of future lepton colliders, such as the International Linear Collider (ILC), the Compact LInear Collider (CLIC) and the Future Circular Collider of electrons and positrons (FCC-ee). An advantage of the experiments is that, even if their beam energies are below the threshold of the production of the new particles, quantum effects of the particles can be detected through high precision measurements. We estimate the capability of future lepton colliders to probe electroweak-interacting particles through the quantum effects, with particular focus on the wino, the Higgsino and the so-called minimal dark matters, and found that a particle whose mass is greater than the beam energy by 100–1000 GeV is detectable by measuring di-fermion production cross sections with O(0.1)% accuracy. In addition, with the use of the same analysis, we also discuss the sensitivity of the future colliders to model independent higher dimensional operators, and found that the cutoff scales corresponding to the operators can be probed up to a few ten TeV.
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Harigaya, K., Ichikawa, K., Kundu, A. et al. Indirect probe of electroweak-interacting particles at future lepton colliders. J. High Energ. Phys. 2015, 105 (2015). https://doi.org/10.1007/JHEP09(2015)105
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DOI: https://doi.org/10.1007/JHEP09(2015)105