中文摘要：

我们在一个模型无关的框架在 Wtb 有效 couplings 上调查新物理效果。新物理效果能是由四独立 couplings 的 parametrized，，，并且。我们进一步介绍展出一种线性关系到单个最高的生产十字节的一套参数 x ₀, x _m , x _p 和 x ₅ 。用为t隧道单身者顶生产十字节 _t ,的最近的数据， tW 联系了生产十字节 _{在 8 TeV LHC 和 Tevatron 收集的 tW} ,s隧道单身者顶生产十字节 _s ,和 W-helicity 部分 F ₀, F _L 和 F _R ，我们表演一全球适合在最高的夸克上强加限制有效 couplings 。我们的全球适合结果证明最高的夸克有效 couplings 强烈被相关。我们显示出改进 _t 和 _tW 在抑制(,) 和(,) 的关联是重要的；(ii ) 并且是相关反的，并且对所有四个实验敏感；(iii ) 并且也是相关反的，并且对 F ₀ 和 F _L 敏感大小；(iv ) 关联在之间并且对 _t , _tW 和 F ₀ 大小。有效 Wtb couplings 在三种新物理模型被学习：G (221 )= 苏(2 )₁ 苏(2 )₂ U (1 ) _X 模特儿，像向量的夸克模型和最小的 Higgs 有或没有 T 同等值当模特儿。当新重计量器波色子集中时，我们证明在左右的模型和未统一的模型的 Wtb couplings 对计量器 couplings 的比率敏感( M _W )是不到几百 GeV ，但是限制是松开的如果 M _W > 1 TeV 。而且，在像向量的夸克的 Wtb couplings 当模特儿，最小的 Higgs 模型对新重粒子和 SM 粒子的混合角度敏感。

英文摘要：

We investigate new physics effects on the Wtb effective couplings in a model-independent framework. The new physics effects can be parametrized by four independent couplings, f1^L, f1^R, f2^L and f2^R. We further introduce a set of parameters x0, xm, xp and x5 which exhibit a linear relation to the single top production cross sections. Using recent data for the t-channel single top production cross section at, tW associated production cross section crtw, s-channel single top production cross section δs, and W-helicity fractions F0, FL and FR collected at the 8 TeV LHC and Tevatron, we perform a global fit to impose constraints on the top quark effective couplings. Our globM fitting results show that the top quark effective couplings are strongly correlated. We show that （i） improving the measurements of δt and δtw is important in constraining the correlation of （f1^R, f2^R） and （f2^L,f2^R）; （ii） f1^L and f2^R are anti-correlated, and are sensitive to all the four experiments; （iii） f1^R and f2^L are also anti-correlated, and are sensitive to the F0 and FL measurements; （iv） the correlation between f2^L and f2^R is sensitive to the precision of the δt, δtw and F0 measurements. The effective Wtb couplings are studied in three kinds of new physics models： the G（221） = SU（2）1 SU（2）2 U（1）x models, the vector-like quark models and the Littlest Higgs model with and without T-parity. We show that the Wtb couplings in the left-right model and the un-unified model are sensitive to the ratio of gauge couplings when the new heavy gauge boson＇s mass （Mw,） is less than several hundred GeV, but the constraint is loose if Mw^t 〉 1 TeV. Fhrthermore, the Wtb couplings in vector-like quark models and the Littlest Higgs models are sensitive to the mixing angles of new heavy particles and SM particles.