C．D．Carone模型中的t夸克稀有衰变

Rare Decays of the Top Quark in the TechnicolorModel With a Massless Scalar Doublet

最近Ｃ．Ｄ．Ｃａｒｏｎｅ和Ｈ．Ｇｅｏｒｇｉ提出了一种最小的Ｔｅｃｈｎｉｃｏｌｏｒ模型ＭＴＣ，该模型具有一个无质量的标量子．本文计算了ＭＴＣ模型对ｔ夸克稀有衰变ｔ→ＣＶ（Ｖ＝Ｚ、γ、ｇ）的单圈修正．发现与标准模型相比，ＭＴＣ的贡献要提高３—４个数量级．ＭＴＣ模型对ｔ→ｃＶ贡献为：Ｂ（ｔ→ｃＺ）～１０－７，Ｂ（ｔ→ｃγ）～１０－９，Ｂ（ｔ→ｃｇ）～１０－６．这为在未来加速器上探测ｔ夸克的稀有衰变提供了很好的理论依据．

The rare decays t→ cV(V=Z,γ,g)induced through loop diagrams are calculated in a minimal Technicolor model(MTC) with a massless weak doublet recently presented by C.D.Carone and H. Georgi.We find that these new contributions can enhance the SM branching fractions by as much as 3-4 orders of magnitude,i.e.,B(t→cZ)≈10-7,B(t→cγ)≈10-9, B(t→cg)≈10-6 for the favorable values of the parameters.It might provide a unique window to detect the virtual effects of technipions in MTC theory.