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Top Quark Flavor Changing Decay t→ cH^0 in Little Higgs Model
作者姓名:Farshid  Tabbakh  LIU  Jing-Jing  MA  Wen-Gan  ZHANG  Ren-You  HOU  Hong-Sheng
作者单位:Department of Modern Physics, University of Science and Technology of China, Hefei 230027, China
基金项目:The project supported by National Natural Science Foundation of China
摘    要:We study theoretically the quantum effects of the littlest Higgs model (LH) mediated by flavor changing one-loop Feynman diagrams on the rare decay process t→ cH^0. The comparison of the decay width in the LH model with that in the standard model (SM) is made. We find that the decay branch ratio of t→ cH^0 in the LH model is at most of the order-10^-12, which is two order larger than in the SM. The numerical results show that the difference between the branch ratios in the LH model and the SM is generally sensitive to the LH model parameters, such as symmetry breaking scale f, Higgs boson mass mH0, and x=v'4f/v^2 in our chosen parameter space, but relatively insensitive to the value choice of the cosine of the mixing angle c and the ratio λ1/λ2.

关 键 词:希格斯介子  夸克  Feynman图表  LH模型  对称性
收稿时间:2005-02-28
修稿时间:2005-02-28
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