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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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The third-generation-philic WIMP: an EFT analysis.

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We explored fermionic and scalar dark matter (DM) interactions with third-generation Standard Model fermions. Current constraints allow for new physics that could solve the electroweak hierarchy problem, with specific DM candidates detectable soon.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter (DM) candidates, including fermionic and scalar types, are theorized to interact with Standard Model (SM) particles.
  • Understanding these interactions is crucial for identifying DM and its role in the universe.

Purpose of the Study:

  • To investigate the direct-detection constraints on fermionic and scalar DM candidates that couple predominantly to third-generation SM fermions.
  • To explore the possibility of connecting this new physics to solutions for the electroweak hierarchy problem.
  • To identify viable parameter space for DM candidates within an effective field theory (EFT) framework and beyond.

Main Methods:

  • Utilizing an effective field theory (EFT) framework to describe DM interactions with third-generation SM fermions.
  • Analyzing current direct-detection experimental constraints on these interactions.
  • Imposing the observed relic abundance from thermal freeze-out to define DM parameter space.
  • Exploring scenarios beyond the EFT with a vector mediator for resonant DM annihilation.

Main Results:

  • Current direct-detection constraints are significantly weaker for third-generation-specific couplings compared to flavor-universal couplings.
  • Effective scales in the few-TeV range remain allowed, suggesting potential links to electroweak hierarchy problem solutions.
  • A specific region for a fermionic DM candidate (1-2 TeV mass) is identified by matching relic abundance, which will be probed by upcoming experiments.
  • Additional parameter space for both fermion and scalar DM is accessible by extending the EFT with a vector mediator.

Conclusions:

  • New physics models with DM coupling to third-generation fermions are less constrained than previously thought.
  • There is a viable window for fermionic DM around 1-2 TeV that future direct-detection experiments will test.
  • Extending the EFT with mediators opens further possibilities for DM detection and model building.