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The Search for Feebly-Interacting Particles
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At the dawn of a new decade, particle physics faces the challenge of explaining the mystery of dark matter, the origin of matter over antimatter in the Universe, the apparent fine-tuning of the electro-weak scale, and many other aspects of fundamental physics. Perhaps the most striking frontier to emerge in the search for answers involves new physics at mass scales comparable to familiar matter, below the GeV scale, but with very feeble interaction strength. New theoretical ideas to address dark matter and other fundamental questions predict such feebly interacting particles (FIPs) at these scales, and indeed, existing data may even provide hints of this possibility. Emboldened by the lessons of the LHC, a vibrant experimental program to discover such physics is under way, guided by a systematic theoretical approach firmly grounded on the underlying principles of the Standard Model. We give an overview of these efforts, their motivations, and the decadal goals that animate the community involved in the search for FIPs, with special focus on accelerator-based experiments.
Forward citations
Cited by 4 Pith papers
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Search for sub-GeV dark particles in $\eta\to\pi^0+\rm{invisible}$ decay
No signal found in first search for eta to pi0 plus invisible dark scalar decay, setting branching fraction limits of (1.8-5.5)x10^-5 at 90% CL and improving DM-nucleon cross section bounds by ~5 orders of magnitude.
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The $B^+ \to K^+ \nu \bar \nu$ decay as a search for the QCD axion
Model-independent reinterpretation of Belle II B+ → K+ νν̄ data using public kinematic mapping yields a factor-of-nine improvement on the limit for B+ → K+ a and constrains the axion's b-s flavor-changing coupling.
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Exploring non-equilibrium effects in sequential freeze-in
In a two-scalar dark sector, non-equilibrium phase-space evolution during sequential freeze-in alters the dark matter relic abundance by up to an order of magnitude relative to the standard number-density treatment.
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Search for the production of Higgs-portal scalar bosons in the NuMI beam using the MicroBooNE detector
MicroBooNE sets the strongest limits to date on the Higgs-portal scalar mixing angle θ below ~3×10^{-4} for masses 110-155 MeV using kaon decays in the NuMI beam and 2.01×10^{21} POT exposure.
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