XENON1T S2 data constrain the solar scalar-electron coupling below 2e-15 at 90% CL, about three times weaker than the best stellar cooling bound.
Relaxion and light (pseudo)scalars at the HL-LHC and lepton colliders
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abstract
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 $\phi$. 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 $Z\phi$ and $\gamma \phi$ production are promising channels to yield strong bounds.
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Searching for a solar relaxion/scalar with XENON1T and LUX
XENON1T S2 data constrain the solar scalar-electron coupling below 2e-15 at 90% CL, about three times weaker than the best stellar cooling bound.