A vector-like heavy quark in the Littlest Higgs model

Abstract

The Littlest Higgs model contains a new vector-like heavy quark in the up sector. There are two interesting features of its existence. One is that it extends the $3\times 3$ CKM matrix in the Standard Model to a $4\times 3$ matrix and the other is that it allows Z-mediated flavor changing neutral currents at tree level in the up sector but not in the down sector. We examine a few of possible windows in which the Z-mediated flavor changing neutral currents in the Littlest Higgs Model can be tested.

15 pages, 2 figures; typos added; section 4 changed

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• Composite Higgses
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• The flavor of a little Higgs with T-parity
• B, D and K decays
• A Fermionic Top Partner: Naturalness and the LHC
• The Intermediate Higgs
• New Physics contributions to the lifetime difference in D0-anti-D0 mixing
• Rare K and B Decays in the Littlest Higgs Model without T-Parity
• Effects of Littlest Higgs model in rare D meson decays
• Updated constraints on new physics in rare charm decays
• Alternatives to an Elementary Higgs
• CP Violation in D0 - anti-D0 Oscillations: General Considerations and Applications to the Littlest Higgs Model with T-Parity
• Particle-Antiparticle Mixing, epsilon_K, Delta Gamma_q, A_SL^q, A_CP(B_d -> psi K_S), A_CP(B_s -> psi phi) and B -> X_{s,d} gamma in the Littlest Higgs Model with T-Parity
• Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
• D-\bar D mixing and rare D decays in the Littlest Higgs model with non-unitarity matrix
• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• Neutrino Masses in the Composite Little Higgs Model
• Probing the gauge bosons $Z^{\prime }$ and $B^{\prime }$ from the Littlest Higgs model in the high-energy linear $e^{+}{e}^{-}$ colliders
• Associated production of the top-pions and single top at hadron colliders
• New gauge boson $B_H$ production associated with W boson pair via $\gamma \gamma$ collision in the littlest Higgs model
• Single production of the vector-like top quark in the littlest Higgs model at TeV energy $e^{-}\gamma$ colliders
• Search for the vector-like top quark $T$ at the future linac-ring type $ep$ collider
• On the flavor structure of the littlest Higgs model
• Single production of heavy top quark from the three-site Higgsless model
• Littlest Higgs model and top-charm production at high-energy linear colliders