Phenomenology of relaxion-Higgs mixing
By T. Flacke, C. Frugiuele, Elina Fuchs, Rick S. Gupta, G. Perez. 2016
158 citations recorded by the source corpus.
A bstractWe show that the relaxion generically stops its rolling at a point that breaks CP leading to relaxion-Higgs mixing. This opens the door to a variety of observational probes since the possible relaxion mass spans a broad range from sub-eV to the GeV scale. We derive constraints from current experiments (fifth force, astrophysical and cosmological probes, beam dump, flavour, LEP and LHC) and present projections from future experiments such as NA62, SHiP and PIXIE. We find that a large region of the parameter space is already under the experimental scrutiny. All the experimental constraints we derive are equally applicable for general Higgs portal models. In addition, we show that simple multiaxion (clockwork) UV completions suffer from a mild fine tuning problem, which increases with the number of sites. These results favour a cut-off scale lower than the existing theoretical bounds.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/d29f42b9067f56e31ad548307ca003ec1de370bb
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In Nuclear and High Energy Physics
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- Cms Collaboration
- Pavel M. Nadolsky
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- Jonathan L. Feng
- K. Schmidt-Hoberg
Citations in the corpus
- Stellar cooling bounds on new light particles: plasma mixing effects (2016, background): “ (see text) in red and orange, and cosmological constraints in green. The latter arise from a freeze-in relic abundance decaying around the present day, contributing to the observed photon background [44] (we show these bounds as extending up to couplings at which ˚would decay at BBN time, though it”
- The Forward Physics Facility: Sites, experiments, and physics potential (2021, background): “hierarchy problem [54, 66], DM [67], inflation [68–70], and the cosmological constant problem [71].”
- Expression of interest for the CODEX-b detector (2019, unknown): “[105, 106].”
- Revised constraints and Belle II sensitivity for visible and invisible axion-like particles (2017, background): “Moreover, it has been pointed out that ALPs may play a crucial role in electroweak symmetry breaking and the solution of the hierarchy problem [31] via the so-called relaxion mechanism [32].”
- Recent Progress in the Physics of Axions and Axion-Like Particles (2020, background): “They include first of all the relaxion solution to the weak scale hierarchy problem [10], which turns out to have a variety of interesting phenomenological implications [18–20].”