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arXiv 0907.1324hep-ph
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强子对撞机上$t\bar tγ$相关产生的QCD修正

QCD corrections to associated production of $t\bar tγ$ at hadron colliders

Duan Peng-Fei, Ma Wen-Gan, Zhang Ren-You, Han Liang, Guo Lei, Wang Shao-Ming

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34 pages, 18 figures, to be published in Phys. Rev. D, publishing version
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摘要：

本文报道了在费米实验室Tevatron RUN II和欧洲核子研究中心大型强子对撞机（LHC）上进行的与光子有关的顶夸克对产生的次领先阶（NLO）QCD计算。我们描述了完整的NLO QCD辐射修正对这一过程的影响，给出了LHC和Tevatron的首阶积分截面、顶夸克和光子的横动量分布以及Tevatron的首阶积分和NLO前-后向顶夸克电荷不对称性的预言。我们研究了LO和NLO截面对重整化/因子化标度的依赖性，发现通过NLO QCD修正，LO截面的标度依赖性得到了明显的改善。对于Tevatron（LHC），NLO QCD修正的K因子为$0.977(1.524)$。

英文摘要：

We report on the next-to-leading order(NLO) QCD computation of top-quark pair production in association with a photon at the Fermilab Tevatron RUN II and CERN Large Hadron Collider(LHC). We describe the impact of the complete NLO QCD radiative corrections to this process, and provide the predictions of the leading order(LO) and NLO integrated cross sections, distributions of the transverse momenta of top-quark and photon for the LHC and Tevatron, and the LO and NLO forward-backward top-quark charge asymmetries for the Tevatron. We investigate the dependence of the LO and NLO cross sections on the renormalization/factorization scale, and find the scale dependence of the LO cross section is obviously improved by the NLO QCD corrections. The K-factor of the NLO QCD correction is $0.977(1.524)$ for the Tevatron(LHC).

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