论文标题
Diphoton分布在LHC处的比例和隔离灵敏度
Scale and isolation sensitivity of diphoton distributions at the LHC
论文作者
论文摘要
LHC在LHC处的双tot子分布的精确测量表现出与理论预测的一定张力，该预测在QCD中的近代到接头顺序（NNLO）获得。我们通过平滑型分离以及对重态化和分解量表的功能形式的选择来重新审视由实验光子隔离的近似而产生的理论不确定性。我们发现所产生的变化总体上是实质性的，并且在某些地区得到了增强。我们讨论了相关分布中基于锥体隔离的锥界的红外敏感性。最后，我们将预测与动态规模和隔离处方的替代选择与来自ATLAS 8 TEV的实验数据进行了比较，从而观察到了改善的一致性。这与先前的结果形成鲜明对比，强调了规模的选择和隔离处方是先前低估的理论不确定性的潜在来源。
Precision measurements of diphoton distributions at the LHC display some tension with theory predictions, obtained at next-to-next-to-leading order (NNLO) in QCD. We revisit the theoretical uncertainties arising from the approximation of the experimental photon isolation by smooth-cone isolation, and from the choice of functional form for the renormalisation and factorisation scales. We find that the resulting variations are substantial overall, and enhanced in certain regions. We discuss the infrared sensitivity at the cone boundaries in cone-based isolation in related distributions. Finally, we compare predictions made with alternative choices of dynamical scale and isolation prescriptions to experimental data from ATLAS at 8 TeV, observing improved agreement. This contrasts with previous results, highlighting that scale choice and isolation prescription are potential sources of theoretical uncertainty that were previously underestimated.
