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We calculate the most interesting rare and CP-violating K and B decays in the Littlest Higgs model with T-parity. We give a collection of Feynman rules including v^2/f^2 contributions that are presented here for the first time and could turn out to be useful also for applications outside flavour physics. We adopt a model-independent parameterization of rare decays in terms of the gauge independent functions X_i,Y_i,Z_i (i=K,d,s), which is in particular useful for the study of the breaking of the universality between K, B_d and B_s systems through non-MFV interactions. Performing the calculation in the unitary and t Hooft-Feynman gauge, we find that the final result contains a divergence which signals some sensitivity to the ultraviolet completion of the theory. Including an estimate of this contribution, we calculate the branching ratios for the decays $K^+topi^+ ubar u$, $K_Ltopi^0 ubar u$, $B_{s,d}to mu^+mu^-$, $Bto X_{s,d} ubar u$, $K_L topi^0ell^+ell^-$ and $Bto X_{s,d}ell^+ell^-$, paying particular attention to non-MFV contributions present in the model. Imposing all available constraints we find that the decay rates for $B_{s,d} to mu^+ mu^-$ and $B to X_{s,d} u bar u$ can be enhanced by at most 50% and 35% relative to the SM values, while $Br(K^+topi^+ ubar u)$ and $Br(K_Ltopi^0 ubar u)$ can be both as high as $5 cdot 10^{-10}$. Significant enhancements of the decay rates $K_L topi^0ell^+ell^-$ are also possible. Simultaneously, the CP-asymmetries $S_{psi phi}$ and $A^s_text{SL}$ can be enhanced by an order of magnitude, while the electroweak penguin effects in $B to pi K$ turn out to be small, in agreement with the recent data.
In the framework of the littlest Higgs model with T-parity (LHT), we study the contributions of the T-even and T-odd particles to the branching ratio R_b. We find that the precision data of R_b can give strong constraints on the masses of T-odd fermions.
In this paper we consider the effects of the T-parity violating anomalous Wess-Zumino-Witten-Term in the Littlest Higgs model. Apart from tree level processes, the loop induced decays of the heavy mirror particles into light standard model fermions l
The Little Higgs model with T-parity (LHT) belongs to the non-minimal flavour violating model. This model has new sources of flavour and CP violation both in quark and leptonic sectors. These new sources of flavour violation originates by the interac
Lepton flavor violation in tau and mu processes is studied in the littlest Higgs model with T-parity. We consider various asymmetries defined in polarized tau and mu decays. Correlations among branching ratios and asymmetries are shown in the followi
Little Higgs models are an interesting alternative to explain electroweak symmetry breaking without fine-tuning. Supplemented with a discrete symmetry (T-parity) constraints from electroweak precision data are naturally evaded and also a viable dark