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D–D ̄ mixing and rare D decays in the littlest Higgs model with non-unitarity matrix by Chuan-Hung Chen; Chao-Qiang Geng; Tzu-Chiang Yuan is a Physics and Astronomy article available to read on EtoBox.

What is D–D ̄ mixing and rare D decays in the littlest Higgs model with non-unitarity matrix about?

We study the D-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 × 3 Cabibbo-Kobayashi-Maskawa matrix is extended to a non-unitary 4 × 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-D mixing parameter can be as large as the current experimental value and the decay branching ratio (BR) of D → X u γ is small but its direct CP asymmetry could be O(10%). In addition, we find that the BRs of D → X u + -, D → X u ν ν and D → μ + μ -could be enhanced to be O(10 -9 ), O(10 -8 ) and O(10 -9 ), respectively.

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Author

Chuan-Hung Chen; Chao-Qiang Geng; Tzu-Chiang Yuan

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0370-2693)

Published

2007

Language

EN

Field

Physics and Astronomy (Physical Sciences)