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arXiv 1111.0759hep-ph
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$H^-t$和$Wt$生产中的主要极化研究

Top polarisation studies in $H^-t$ and $Wt$ production

Rohini M. Godbole, Lisa Hartgring, Irene Niessen, Chris D. White

备注：
33 pages, 35 figures, references added
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摘要：

在高能过程中产生的顶夸克的极化可以是标准模型之外的物理学的一个非常敏感的探针。顶夸克衰变产物的运动学分布可以提供关于产生的顶夸克的极化的清晰信息，从而可以探测顶夸克扇区中的新物理效应。我们研究了最近提出的一些极化观测值，涉及顶夸克的衰变产物的背景下，$H^-t$和$Wt$生产。我们表明，顶部极化的衰变轻子方位角分布的影响，最近研究的这些过程中，在QCD领先的顺序，是强大的，相对于列入下一个领先的顺序和部分子簇射修正。我们还考虑轻子极角，以及最近提出的能量相关的顶部衰变产物的分布。我们从这些观测量构造了非对称参数，它可以用来区分新的物理信号和$Wt$背景，并在一般的II型双Higgs模型中区分不同的$\tanβ$和$m_{H^-}$值。最后，我们表明，类似的观测可能是有用的分离标准模型$Wt$信号从更大的QCD诱导的顶部对生产背景。

英文摘要：

The polarisation of top quarks produced in high energy processes can be a very sensitive probe of physics beyond the Standard Model. The kinematical distributions of the decay products of the top quark can provide clean information on the polarisation of the produced top and thus can probe new physics effects in the top quark sector. We study some of the recently proposed polarisation observables involving the decay products of the top quark in the context of $H^-t$ and $Wt$ production. We show that the effect of the top polarisation on the decay lepton azimuthal angle distribution, studied recently for these processes at leading order in QCD, is robust with respect to the inclusion of next-to-leading order and parton shower corrections. We also consider the leptonic polar angle, as well as recently proposed energy-related distributions of the top decay products. We construct asymmetry parameters from these observables, which can be used to distinguish the new physics signal from the $Wt$ background and discriminate between different values of $\tanβ$ and $m_{H^-}$ in a general type II two-Higgs doublet model. Finally, we show that similar observables may be useful in separating a Standard Model $Wt$ signal from the much larger QCD induced top pair production background.

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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