Currie J, Gehrmann-De Ridder A, Gehrmann T, Glover E W N, Huss A, Pires J
Institute for Particle Physics Phenomenology, University of Durham, Durham DH1 3LE, United Kingdom.
Institute for Theoretical Physics, ETH, CH-8093 Zürich, Switzerland.
Phys Rev Lett. 2017 Oct 13;119(15):152001. doi: 10.1103/PhysRevLett.119.152001. Epub 2017 Oct 11.
We present the calculation of dijet production, doubly differential in dijet mass m_{jj} and rapidity difference |y^{*}|, at leading color in all partonic channels at next-to-next-to-leading order (NNLO) in perturbative QCD. We consider the long-standing problems associated with scale choice for dijet production at next-to-leading order (NLO) and investigate the impact of including the NNLO contribution. We find that the NNLO theory provides reliable predictions, even when using scale choices that display pathological behavior at NLO. We choose the dijet invariant mass as the theoretical scale on the grounds of perturbative convergence and residual scale variation and compare the predictions to the ATLAS 7 TeV 4.5 fb^{-1} data.
我们给出了在微扰量子色动力学（QCD）中次下一个领先阶（NNLO）的所有部分子通道中，双喷注产生的计算结果，该结果对双喷注质量(m_{jj})和快度差(|y^{*}|)进行了双重微分。我们考虑了与次领先阶（NLO）双喷注产生的尺度选择相关的长期问题，并研究了包含NNLO贡献的影响。我们发现，即使使用在NLO时表现出病态行为的尺度选择，NNLO理论也能提供可靠的预测。基于微扰收敛性和剩余尺度变化，我们选择双喷注不变质量作为理论尺度，并将预测结果与ATLAS 7 TeV 4.5 fb⁻¹数据进行比较。
