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arXiv 1209.4564hep-phhep-ex
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强子对撞机反常顶耦合的再研究

Anomalous Top Couplings at Hadron Colliders Revisited

Fabian Bach, Thorsten Ohl

备注：
35 pages, 11 figures. Published version
发表信息：
Phys. Rev. D 86, 114026 (2012)
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摘要：

在一个有效的运营商的方法，全套的领先贡献异常顶部耦合包括各种新的三线性以及更高的相互作用顶点，其中一些是相互关联的规范对称性或运动方程。为了研究SM规范玻色子的三线性顶耦合，如ttA，ttZ，tbW和ttg，可以相应地限制算子集。然而，完整的基础不能被映射到一个单独的三线性顶点的壳上参数化。如果要保持与算符基的关系，必须包括四费米子接触项qqtt和udtb。在本文中，我们指出这些相互作用如何有助于在LHC和Tevatron的异常三线性tbW耦合的单顶搜索通道，从而影响相应的界限。所有的结果都是基于完整的前导阶部分子矩阵元素，从而自动占壳外和干扰的影响，以及不可约的背景。还提供了从壳顶到完整矩阵元素（包括验收切割）的定量影响的讨论。

英文摘要：

In an effective operator approach, the full set of leading contributions to anomalous top couplings comprises various new trilinear as well as higher interaction vertices, some of which are related to one another by gauge symmetry or equations of motion. In order to study trilinear top couplings to SM gauge bosons such as ttA, ttZ, tbW and ttg, the operator set can be restricted accordingly. However, the complete basis cannot be mapped onto an on-shell parametrisation of the trilinear vertices alone. Four-fermion contact terms qqtt and udtb must be included if the relation to the operator basis is to be retained. In this paper, we point out how these interactions contribute to the single top search channels for anomalous trilinear tbW couplings at the LHC and Tevatron, thus affecting the corresponding bounds. All results are based on full leading-order partonic matrix elements, thus automatically accounting for off-shell and interference effects as well as irreducible backgrounds. A discussion of the quantitative effects of going from on-shell tops to full matrix elements including acceptance cuts is also provided.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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