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Aligned and Spontaneous Flavor Violation.

Daniel Egana-Ugrinovic1, Samuel Homiller1,2, Patrick Meade1

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We introduce aligned flavor violation (AFV), a new physics framework for quark couplings. A subset, spontaneous flavor violation (SFV), naturally suppresses flavor-changing neutral currents and may appear near the TeV scale.

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Area of Science:

  • Particle Physics
  • Beyond Standard Model Physics
  • Quantum Field Theory

Background:

  • The Standard Model (SM) describes fundamental particles and forces.
  • Yukawa couplings in the SM govern quark masses and mixings.
  • Existing models struggle to explain flavor hierarchies and CP violation.

Purpose of the Study:

  • Introduce a systematic spurion setup called aligned flavor violation (AFV).
  • Explore spontaneous flavor violation (SFV) as a natural subset of AFV.
  • Investigate implications for flavor-changing neutral currents and new physics scales.

Main Methods:

  • Developed the aligned flavor violation (AFV) spurion framework.
  • Analyzed spontaneous flavor violation (SFV) arising from spontaneously broken flavor and CP symmetries.
  • Employed effective field theory techniques to study SFV models.

Main Results:

  • AFV allows new physics couplings aligned with SM Yukawa couplings.
  • SFV naturally suppresses flavor-changing neutral currents.
  • SFV new physics with preferential couplings to light quarks may exist at the TeV scale.

Conclusions:

  • AFV provides a flexible framework for new physics beyond the Standard Model.
  • SFV offers a compelling scenario with suppressed flavor-changing neutral currents.
  • The TeV scale is a viable region for discovering SFV physics, particularly affecting first and second generation quarks.