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

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dc.creatorChen, Chuan-Hung
dc.creatorGeng, Chao-Qiang
dc.creatorYuan, Tzu-Chiang
dc.date2007-04-04
dc.date2007-10-24
dc.date.accessioned2026-07-07T10:59:24Z
dc.date.available2026-07-07T10:59:24Z
dc.descriptionWe 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 $D\to X_u \ell^{+} \ell^{-}$, $D\to X_uν\bar ν$ and $D\to μ^{+} μ^{-}$ could be enhanced to be $O(10^{-9})$, $O(10^{-8})$ and $O(10^{-9})$, respectively.
dc.description18 pages, 6 figures, references added and updated, version to appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0704.0601
dc.identifierhttp://arxiv.org/abs/0704.0601
dc.identifierPhys.Lett.B655:50-57,2007
dc.identifierdoi:10.1016/j.physletb.2007.08.084
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187387
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleD-\bar D mixing and rare D decays in the Littlest Higgs model with non-unitarity matrix
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