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arXiv 1304.2675hep-ph
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最小味破坏和反常顶衰变

Minimal Flavour Violation and Anomalous Top Decays

Sven Faller, Stefan Gadatsch, Thomas Mannel

摘要:

大型强子对撞机上的顶夸克物理学可能会为标准模型之外的物理学打开一扇窗户,甚至引导我们理解“味道”现象。然而,目前的味道数据是一个强烈的暗示,没有“新的物理学”与通用的味道结构可以预期在TeV规模。反过来,如果在TeV尺度上存在“新物理学”,它必须是“最小的味道违反”。这已成为“新物理学”模型中被广泛接受的假设。在本文中,我们提出了一个独立于模型的方案,以测试在有效场论框架内的异常带电$Wtq$,$q\in{d,s,b}$,以及味道改变的$Vtq$,$q\in{u,c}$和$V\in{Z,γ,g}$耦合的最小味道破坏,即,以独立于模型的方式。我们对我们的有效场论方法进行了spuron分析,并使用II型双希格斯偶线模型,根据不同螺旋度的有效耦合计算了异常顶夸克衰变的衰变率。假设顶夸克是在高能碰撞中产生的,并作为准自由粒子衰变。

英文摘要:

Top quark physics at the LHC may open a window to physics beyond the standard model and even lead us to an understanding of the phenomenon "flavour". However, current flavour data is a strong hint that no "new physics" with a generic flavour structure can be expected in the TeV scale. In turn, if there is "new physics" at the TeV scale, it must be "minimally flavour violating". This has become a widely accepted assumption for "new physics" models. In this paper we propose a model-independent scheme to test minimal flavour violation for the anomalous charged $Wtq$, $q\in{d,s,b}$, and flavour-changing $Vtq$, $q\in{u,c}$ and $V\in{Z,γ,g}$ couplings within an effective field theory framework, i.e., in a model-independent way. We perform a spurion analysis of our effective field theory approach and calculate the decay rates for the anomalous top-quark decays in terms of the effective couplings for different helicities by using a two-Higgs doublet model of type II, under the assumption that the top-quark is produced at a high-energy collision and decays as a quasi-free particle.

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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