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A facility to search for hidden particles at the CERN SPS: the SHiP physics case
TLDR
It is demonstrated that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
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Electric dipole moments as probes of new physics
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Neutrino trident production: a powerful probe of new physics with neutrino beams.
TLDR
The production of a μ+ μ- pair from the scattering of a muon neutrino off the Coulomb field of a nucleus is shown to be an exquisitely sensitive probe in the search for new neutral currents among leptons, putting the strongest constraints on well-motivated and well-hidden extensions of the standard model gauge group.
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Physics beyond colliders at CERN: beyond the Standard Model working group report
The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of the CERN's accelerator complex and scientific infrastructures through projects…
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Particle physics catalysis of thermal big bang nucleosynthesis.
TLDR
In particle physics models where subsequent decay of X- does not lead to large nonthermal big bang nucleosynthesis effects, this directly translates to the level of sensitivity to the number density of long-lived X- particles relative to entropy of nX-/s less, which is one of the most stringent probes of electroweak scale remnants known to date.
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Exploring Portals to a Hidden Sector Through Fixed Targets
We discuss the sensitivity of neutrino experiments at the luminosity frontier to generic hidden sectors containing new (sub)-GeV neutral states. The weak interaction of these states with the standard…
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Ultraviolet modifications of dispersion relations in effective field theory.
TLDR
Effective field theory is applied and dimension-5 operators that do not mix with dimensions 3 and 4 and lead to cubic modifications of dispersion relations for scalars, fermions, and vector particles are identified.
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Working Group Report: New Light Weakly Coupled Particles
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new…
Hunting for topological dark matter with atomic clocks
A proposal for detecting dark matter originating from light fields rather than particles makes use of existing networks of atomic clocks to measure time discrepancies between clocks that are…
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Long-lived particles at the energy frontier: the MATHUSLA physics case
TLDR
A model-independent approach is developed to describe the sensitivity of MATHUSLA to BSM LLP signals, and a general discussion of the top-down and bottom-up motivations for LLP searches are synthesized to demonstrate the exceptional strength and breadth of the physics case for the construction of the MATH USLA detector.
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