Electroweak precision constraints on the littlest Higgs model with T parity

Jay Hubisz, Patrick Meade, Andrew Noble, Maxim Perelstein

Research output: Contribution to journalArticlepeer-review

216 Scopus citations


We compute the leading corrections to the properties of W and Z bosons induced at the one-loop level in the SU(5)/SO(5) Littlest Higgs model with T parity, and perform a global fit to precision electroweak data to determine the constraints on the model parameters. We find that a large part of the model parameter space is consistent with data. Values of the symmetry breaking scale f as low as 500 GeV are allowed, indicating that no significant fine tuning in the Higgs potential is required. We identify a region within the allowed parameter space in which the lightest T-odd particle, the partner of the hypercharge gauge boson, has the correct relic abundance to play the role of dark matter. In addition, we find that a consistent fit to data can be obtained for large values of the Higgs mass, up to 800 GeV, due to the possibility of a partial cancellation between the contributions to the T parameter from Higgs loops and new physics.

Original languageEnglish (US)
Pages (from-to)3441-3464
Number of pages24
JournalJournal of High Energy Physics
Issue number1
StatePublished - 2006
Externally publishedYes


  • Beyond Standard Model
  • Higgs Physics
  • LEP HERA and SLC Physics
  • Technicolor and Composite Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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