D-\bar D mixing and rare D decays in the Littlest Higgs model with non-unitarity matrix

Abstract

We study the $D-\bar{D}$ mixing and rare D decays in the Littlest Higgs model. As the new weak singlet quark with the electric charge of 2/3 is introduced to cancel the quadratic divergence induced by the top-quark, the standard unitary $3\times 3$ Cabibbo-Kobayashi-Maskawa matrix is extended to a non-unitary $4\times 3$ matrix in the quark charged currents and Z-mediated flavor changing neutral currents are generated at tree level. In this model, we show that the $D-\bar{D}$ mixing parameter can be as large as the current experimental value and the decay branching ratio (BR) of $D\to X_u \ga$ is small but its direct CP asymmetry could be $O(10$. In addition, we find that the BRs of $D\to X_u{\ell }^{+}{\ell }^{-}$, $D\to X_u\nu \bar{\nu }$ and $D\to {\mu }^{+}{\mu }^{-}$ could be enhanced to be $O(10^{-9})$, $O(10^{-8})$ and $O(10^{-9})$, respectively.

arXiv comment18 pages, 6 figures, references added and updated, version to appear in Phys. Lett. B

References in corpus (40)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Electroweak symmetry breaking from dimensional deconstruction
• The Littlest Higgs
• Little Higgs Review
• Phenomenology of the Little Higgs Model
• Little Higgs Models and Their Phenomenology
• Observation of Bs-Bsbar Oscillations
• Top Quarks and Electroweak Symmetry Breaking in Little Higgs Models
• Evidence for D0-anti-D0 Mixing
• Observation of a new charmonium state in double charmonium production in e+ e- annihilation at \sqrt{s} ~ 10.6 GeV
• Rare Charm Decays in the Standard Model and Beyond
• Rare and CP-Violating K and B Decays in the Littlest Higgs Model with T-Parity
• SU(3) Breaking and D0-D0bar Mixing
• The flavor of a little Higgs with T-parity
• The $D^0-{\bar{D}}^0$ mass difference from a dispersion relation
• Improved Measurement of cal{B}(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_{D^+}
• D^0 - D^0-bar Oscillations as a Probe of Quark-Hadron Duality
• $D$-$\bar{D}$ Mixing in Heavy Quark Effective Field Theory
• Radiative Weak Decays of Charm Mesons
• D\bar{D}$ Mixing in Heavy Quark Effective Field Theory: The Sequel
• The $c\to u\gamma$ Contribution to Weak Radiative Charm Decay
• Rare K and B Decays in the Littlest Higgs Model without T-Parity
• Effects of Littlest Higgs model in rare D meson decays
• Nonuniversal $Z^{\prime }$ couplings in B decays
• Scalar interactions and the polarizations of $B\to \varphi K^{\ast }$
• $c\to u\gamma$ in the minimal supersymmetric standard model
• Short Distance Analysis of D^0-anti-D^0 Mixing
• Charm mixing in the Standard Model and beyond
• The Radiative Leptonic Decays D^0 -> e^+ e^- gamma, mu^+ mu^- gamma in the Standard Model and Beyond
• $B_d-{\bar{B}}_d$ mass difference in Little Higgs model
• A vector-like heavy quark in the Littlest Higgs model
• Charm as a domain wall fermion in quenched lattice QCD
• Probing New Physics in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ decays
• D-Meson Mixing in Broken SU(3)
• T violation in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ from SUSY
• CP Violation in Hyperon Decays from SUSY with Hermitian Yukawa and A Matrices
• Vector Quark Model and B to X_s gamma Decay
• Rare kaon decays in SUSY with non-universal A terms
• Novel two-loop SUSY effects on CP asymmetry in $B\to \varphi K_s$

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• Global oscillation data analysis on the $3\nu$ mixing without unitarity
• Leptoquark on $P\to {\ell }^{+}\nu$, FCNC and LFV
• Brief Review of Charm Physics
• Impact of colored scalars on $D^0-{\bar{D}}^0$ mixing in diquark models
• Implication of the D^0 Width Difference On CP-Violation in D^0-\bar D^0 Mixing
• Exploring charm decays with missing energy in leptoquark models
• Lifetime difference in D^0 - \bar{D^0} mixing within R-parity-violating SUSY
• Constraint from D - anti-D Mixing in Left-Right Symmetric Models
• On the flavor structure of the littlest Higgs model
• FCNC charmed-hadron decays with invisible singlet particles in light of recent data
• The lepton flavor violating decays $Z\to l_i{l}_j$ in the simplest little Higgs model
• Experimental constraints from flavour changing processes and physics beyond the Standard Model
• On the Non-Manifest Left-Right Model Contribution to the Lifetime Difference in $D^0-{\bar{D}}^0$ Mixing
• Searching for New Physics in $D^0\to {\mu }^{+}{\mu }^{-},e^{+}{e}^{-},{\mu }^{\pm }{e}^{\mp }$ at BES and/or Super Charm-Tau Factory