## Abstract

We construct T-parity invariant extensions of the littlest Higgs model, in which only linear representations of the full symmetry group are employed, without recourse to the non-linear representations introduced by Coleman, Callan, Wess, and Zumino (CCWZ). These models are based on the symmetry breaking pattern SU(5)_{l} × H_{r}/SO(5), where H_{r} can be SO(5) or other larger symmetry groups. The structure of the models in the SU(5)_{l} sector is identical to the littlest Higgs model based on SU(5)/SO(5). Since the full symmetry group is realized linearly, these models can be thought of as possible UV extensions of the T-invariant model using non-linear representations via CCWZ, with whom they share similar low energy phenomenology. We also comment on how to avoid constraints from four-fermion operators on T-invariant models with or without CCWZ construction. The electroweak data therefore place a very weak bound on the symmetry breaking scale, f ≥ 450GeV.

Original language | English (US) |
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Pages (from-to) | 2319-2333 |

Number of pages | 15 |

Journal | Journal of High Energy Physics |

Volume | 8 |

Issue number | 10 |

DOIs | |

State | Published - Oct 1 2004 |

## Keywords

- Beyond Standard Model
- Higgs Physics

## ASJC Scopus subject areas

- Nuclear and High Energy Physics