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arXiv 1004.0876hep-ph
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LHC重共振产生和衰变为顶夸克对的次领先级QCD修正

Next-to-leading order QCD corrections to a heavy resonance production and decay into top quark pair at the LHC

Jun Gao, Chong Sheng Li, Bo Hua Li, C. -P. Yuan, Hua Xing Zhu

摘要:

本文对LHC中重共振产生和衰变为顶夸克对的过程进行了完整的次领先阶(NLO)QCD计算,共振可以是Randall-Sundrum(RS)Kaluza-Klein(KK)引力子$G$,也可以是额外规范玻色子$Z'$ .对$G$和$Z'$,完全的NLO QCD修正可以使总截面分别增加约$80\%- 100\%$和$20\%- 40\%$,这取决于共振质量.我们还详细讨论了顶夸克极角分布的非线性光学修正,结果表明,对于KK引力子,非线性光学分布的形状可以不同于首阶(LO)分布的形状.此外,我们还研究了通过上述过程产生的顶夸克对自旋关联的非线性光学修正,发现修正很小。

英文摘要:

We present a complete next-to-leading order (NLO) QCD calculation to a heavy resonance production and decay into a top quark pair at the LHC, where the resonance could be either a Randall-Sundrum (RS) Kaluza-Klein (KK) graviton $G$ or an extra gauge boson $Z'$. The complete NLO QCD corrections can enhance the total cross sections by about $80\%- 100\%$ and $20\%- 40\%$ for the $G$ and the $Z'$, respectively, depending on the resonance mass. We also explore in detail the NLO corrections to the polar angle distributions of the top quark, and our results show that the shapes of the NLO distributions can be different from the leading order (LO) ones for the KK graviton. Moreover, we study the NLO corrections to the spin correlations of the top quark pair production via the above process, and find that the corrections are small.

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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