4.7 Article

D-(D)over-bar mixing and rare D decays in the littlest Higgs model with non-unitarity matrix

Journal

PHYSICS LETTERS B
Volume 655, Issue 1-2, Pages 50-57

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2007.08.084

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We study the D-(D) over bar 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 x 3 Cabibbo-Kobayashi-Maskawa matrix is extended to a non-unitary 4 x 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) over bar mixing parameter can be as large as the current experimental value and the decay branching ratio (BR) of D -> X-u gamma is small but its direct CP asymmetry could be O(10%). In addition, we find that the BRs D -> X(u)l(+)l(-), D -> D -> X-u nu(nu) over bar couldbe enhanced tobe O(10(-9)), O(10(-8)) and O(10(-9)), respectively. (c) 2007 Elsevier B.V. All rights reserved.

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