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Lepton flavour violation in composite Higgs models.

Ferruccio Feruglio1, Paride Paradisi1, Andrea Pattori2

  • 1Sezione di Padova, Dipartimento di Fisica e Astronomia 'G. Galilei', INFN, Università di Padova, Via Marzolo 8, 35131 Padua, Italy.

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This summary is machine-generated.

This study explores partial compositeness, constraining the compositeness scale using flavour and CP violation data. The compositeness scale is generally above 10 TeV, but can be lower under specific universality conditions.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Theoretical Physics

Background:

  • Partial compositeness is a theoretical framework explaining the origin of mass and flavour in particle physics.
  • Flavour and CP violation in the leptonic sector provide stringent constraints on new physics beyond the Standard Model.

Purpose of the Study:

  • To formulate partial compositeness using flavour symmetry and spurions.
  • To construct dimension-six operators for lepton flavour and CP violation.
  • To derive limits on the compositeness scale from experimental data.

Main Methods:

  • Utilizing a flavour symmetry group and spurions to model partial compositeness.
  • Constructing and analyzing dimension-six operators relevant to lepton flavour and CP violation.
  • Exploiting existing experimental bounds to constrain the compositeness scale.
  • Explicitly computing Wilson coefficients in a two-site model.

Main Results:

  • The general compositeness scale is constrained to be above 10 TeV.
  • Universality in mass parameters and Yukawa couplings can significantly lower this bound.
  • Charged lepton decays, mu-e conversion, and electron electric dipole moments are the most sensitive probes.

Conclusions:

  • The study provides robust constraints on the compositeness scale in various scenarios.
  • The two-site model results are consistent with the general spurion analysis.
  • Specific universality conditions can relax the compositeness scale bounds.