Wgamma and Zgamma production at the LHC in NNLO QCD
Wgamma and Zgamma production at the LHC in NNLO QCD
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DOI：
10.22323/1.235.0074
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
M. Grazzini;S. Kallweit;D. Rathlev
中科院分区：
文献类型：
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作者：
M. Grazzini;S. Kallweit;D. Rathlev
我们考虑了在强子对撞机上W\gamma$和Z\gamma$对的产生。本文报道了QCD微扰理论中次-次-前阶辐射修正的完全微分计算。计算包括矢量玻色子的轻子衰变与相应的自旋相关、脱壳效应和终态光子辐射。我们给出了7和8 TeV下的$pp$碰撞的数值结果，并与现有的LHC数据进行了比较。在$Z\gamma$产量的情况下，NNLO修正的影响通常是温和的，范围从8%到18%，取决于应用的切割。在$W\gamma$产量的情况下，NNLO效应更为重要，其范围从19%到26%，从而提高了理论预测与数据的一致性。正如预期的那样，当应用喷射否决时，QCD辐射修正的影响显着降低。
We consider the production of $W\gamma$ and $Z\gamma$ pairs at hadron colliders. We report on the complete fully differential computation of radiative corrections at next-to-next-to-leading order (NNLO) in QCD perturbation theory. The calculation includes the leptonic decay of the vector boson with the corresponding spin correlations, off shell effects and final-state photon radiation. We present numerical results for $pp$ collisions at 7 and 8 TeV and we compare them with available LHC data. In the case of $Z\gamma$ production, the impact of NNLO corrections is generally moderate, ranging from 8% to 18%, depending on the applied cuts. In the case of $W\gamma$ production, the NNLO effects are more important, and range from 19% to 26%, thereby improving the agreement of the theoretical predictions with the data. As expected, the impact of QCD radiative corrections is significantly reduced when a jet veto is applied.