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arXiv 0910.4349hep-ph
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强子对撞机上通过与模型无关的t-q-g变味中性流耦合产生单个顶夸克的次领先阶QCD修正

Next-to-leading order QCD corrections to the single top quark production via model-independent t-q-g flavor-changing neutral-current couplings at hadron colliders

Jun Gao, Chong Sheng Li, Jia Jun Zhang, Hua Xing Zhu

摘要:

计算了强子对撞机上完全次领先阶QCD效应对模型无关的$tqg$变味中性流耦合诱导的单陀螺产生的影响。结果表明,在Tevatron和LHC上,对于$tcg$耦合,NLO QCD修正可以使总截面分别增加约60%和30%,对于$tug$耦合,NLO QCD修正可以分别增加约50%和20%,这意味着NLO修正可以使FCNC耦合的实验灵敏度分别增加约10%和$-$ 30%。此外,非线性光学修正减少了总截面对重整化或因子化标度的依赖性,从而增加了理论预测的可信度。此外,我们还计算了几个重要的运动学分布的非线性光学修正,发现它们中的大多数的非线性光学修正几乎是相同的,并没有改变分布的形状。

英文摘要:

We present the calculations of the complete next-to-leading order (NLO) QCD effects on the single top productions induced by model-independent $tqg$ flavor-changing neutral-current couplings at hadron colliders. Our results show that, for the $tcg$ coupling the NLO QCD corrections can enhance the total cross sections by about 60% and 30%, and for the $tug$ coupling by about 50% and 20% at the Tevatron and LHC, respectively, which means that the NLO corrections can increase the experimental sensitivity to the FCNC couplings by about 10%$-$30%. Moreover, the NLO corrections reduce the dependence of the total cross sections on the renormalization or factorization scale significantly, which lead to increased confidence on the theoretical predictions. Besides, we also evaluate the NLO corrections to several important kinematic distributions, and find that for most of them the NLO corrections are almost the same and do not change the shape of the distributions.

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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