Quark and Lepton Flavour Physics in the Littlest Higgs Model with T-Parity

TL;DR

This paper explores how the Littlest Higgs model with T-parity introduces new sources of flavour and CP violation, leading to distinctive predictions for rare decays and asymmetries in quark and lepton sectors.

Contribution

It provides a comprehensive analysis of flavour physics in the LHT model, highlighting its unique predictions and differences from the MSSM.

Findings

Significant deviations from the Standard Model in rare kaon decays.

Distinctive lepton flavour violating decay predictions.

Unique CP asymmetry patterns in B and kaon systems.

Abstract

The Littlest Higgs model with T-parity (LHT) contains new sources of flavour and CP violation both in the quark and the lepton sector. They originate from the interactions of ordinary fermions with mirror fermions mediated by new gauge bosons: W_H, Z_H and A_H. The most spectacular departures from the Standard Model are found in K_L -> pi^0 nu {bar nu}, K^+ -> pi^+ nu {bar nu}, in the CP-asymmetry S_{psi phi} and in lepton flavour violating decays. In particular, the latter decays offer a clear distinction between the LHT model and the MSSM. We summarize the most interesting results of three extensive analyses of flavour physics in the LHT model.