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arXiv 1208.0418hep-phhep-ex
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由非通用$Z^\prime$介导的同号顶对产生的特征,其中QCD在LHC处的准确度仅次于领先

Signature of same-sign top pair production mediated by a nonuniversal $Z^\prime$ with QCD next-to-leading accuracy at the LHC

Bo Hua Li, Chong Sheng Li, Hai Tao Li, Yong Chuan Zhan, Yue Zhang, Jian Wang

摘要:

利用窄宽度近似和螺旋度振幅方法,在QCD次领先阶(NLO)水平上,详细研究了大型强子对撞机(LHC)上由非普适$Z^\prime$介导的同号顶对产生过程,包括产生和衰变过程.我们发现,QCD非线性光学修正可以放松对模型参数的约束,显著降低总截面对因子分解标度的依赖性。我们还研究了NLO层面的签名和背景。为了抑制背景,我们进一步研究了LHC中正负电荷双轻子产生率的差异,发现新物理的同号双轻子信号更容易被发现。

英文摘要:

We present a detailed study of the same-sign top pair production mediated by a non-universal $Z^\prime$ including production and decay at the Large Hadron Collider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow width approximation and helicity amplitudes method. We find that the QCD NLO corrections can loose the constraint on the model parameters and reduce the dependence of the total cross sections on the factorization scale significantly. We also study the signature and backgrounds of the process at the NLO level. In order to suppress the backgrounds, we further investigate the difference between the production rates of the positively and negatively charged dilepton at the LHC, and find that the same-sign dilepton signal of the new physics could be discovered more easily.

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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