The flavor of a little Higgs with T-parity

Jay Hubisz, Seung J. Lee, Gil Paz

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


We analyze flavor constraints in the littlest Higgs model with T-parity. In particular, we focus on neutral meson mixing in the K, B, and D systems due to one loop contributions from T-parity odd fermions and gauge bosons. We calculate the short distance contributions to mixing for a general choice of T-odd fermion Yukawa couplings. We find that for a generic choice of textures, a TeV scale GIM suppression is necessary to avoid large contributions. If order one mixing angles are allowed in the extended flavor structure, the mass spectrum is severely constrained, and must be degenerate at the 1-5% level. However, there are still regions of parameter space where only a loose degeneracy is necessary to avoid constraints. We also consider the Bs system, and identify a scenario in which the mixing can be significantly enhanced beyond the standard model prediction while still satisfying bounds on the other mixing observables. We present both analytical and numerical results as functions of the T-odd fermion mass eigenvalues.

Original languageEnglish (US)
Article number041
JournalJournal of High Energy Physics
Issue number6
StatePublished - Jul 1 2006
Externally publishedYes


  • B-Physics
  • Beyond Standard Model
  • CP violation
  • Kaon Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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