We study the potential of future lepton colliders, running at the Z-pole and above, and the High-Luminosity LHC to search for the relaxion and other light scalars ϕ. We investigate the interplay of direct searches and precision observables for both CP-even and -odd couplings. In particular, precision measurements of exotic Z-decays, Higgs couplings, the exotic Higgs decay into a relaxion pair and associated Zϕ and γϕ production are promising channels to yield strong bounds.
@article{arxiv.1807.10842,
title = {Relaxion and light (pseudo)scalars at the HL-LHC and lepton colliders},
author = {Claudia Frugiuele and Elina Fuchs and Gilad Perez and Matthias Schlaffer},
journal= {arXiv preprint arXiv:1807.10842},
year = {2018}
}