荷电PG玻色子对B介子稀有衰变B→X_(s,d)ν■,B_(s,d)→l~+l~-的贡献

在顶夸克辅助的人工色(topcolor-assisted technicolor(简称TC2))模型下,计算荷电玻色子(pseudo-Goldstone bosons(简称PGBs))对稀有衰变B→X_s,_dW,和B_(s,d)→l~+l~-的贡献,并把它们与标准模型的结果相比较,发现在所考虑的参数空间,PGBs对所研究的分支比提高10到30倍,其中top-pion对B分子稀有衰变的贡献起主导作用,理论预言仍与目前的实验数据相符合。这些修正将导致有可能发现新物理存在的证据或对TC2模型本身的严格限制。

The New Contributions to the Rare B Decays B-X_s,_dvv ,Bs.d-l+l-in the Topcolor-assisted Technicolor Model

In this paper,we calculate the new contributions to the rare B-decays, in the top-color-assisted technicolor models,and compare the theoretical prediction with the SM expectation. With the considered parameter space, we find that the enhancements to the branching ratios can be as large as a factor of 10 and 30. The theoretical prections are currently in good agreement with the available data after including the new contributions. The corrections will be very essential to finding the limits of new physics or to constrainting the TC2 models.