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arXiv 0811.3842hep-ph
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一组最小的顶部反常耦合

A minimal set of top anomalous couplings

J. A. Aguilar-Saavedra

摘要:

利用运动方程去除多余的算符,简化了由六维规范不变有效算符产生的费米子-费米子-规范玻色子相互作用的一般形式。发现离壳费米子fi,fj和离壳玻色子V=W,Z,gamma,g的最一般顶点只涉及gamma^mu和sigma^{mu nu} q_nu项,q=p_i-p_j.给出了Wtb,Ztt,gamma tt和gtt相互作用的例子,其一般表达式相对于文献中的结果大大简化.同样的论点也适用于与Z玻色子、光子或胶子的顶级变味中性相互作用,这些相互作用也可以用伽马^μ和西格玛^{mu nu} q_nu耦合进行全面的参数化。给出了这些顶点的显式表达式在六维规范不变的运营商。我们还讨论了如何有效的运营商系数可能被确定从最终测量的异常耦合。

英文摘要:

We simplify the general form of the fermion-fermion-gauge boson interactions generated by dimension-six gauge-invariant effective operators by using the equations of motion to remove redundant operators. It is found that the most general vertex for off-shell fermions fi, fj and an off-shell boson V=W,Z,gamma,g only involves gamma^mu and sigma^{mu nu} q_nu terms, with q=p_i-p_j. Examples are given for the Wtb, Ztt, gamma tt and gtt interactions, whose general expression is greatly simplified with respect to previous results in the literature. The same arguments apply to top flavour-changing neutral interactions with the Z boson, the photon or the gluon, which can also be parameterised in full generality with only gamma^mu and sigma^{mu nu} q_nu couplings. Explicit expressions are given for these vertices in terms of dimension-six gauge-invariant operators. We also discuss how effective operator coefficients might be determined from eventual measurements of anomalous couplings.

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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