论文标题
光子对生产的精确预测与日内瓦的Parton阵雨相匹配
Precise predictions for photon pair production matched to parton showers in GENEVA
论文作者
论文摘要
我们提出了一个新的计算，用于使用NNLL $'_ {\ MATHCAL {t} _0} $+NNLO准确性生产LHC在LHC上生产孤立的光子对。这是Geneva Monte Carlo框架中的第一个实施过程，该过程具有非平凡的Born级定义，其质量为奇异性。在整个计算过程中，我们使用平滑的隔离算法来删除此类差异。 0 jettiness变量$ \ MATHCAL {T} _0 $的高阶重新召集基于软共线有效理论中得出的分解公式，该公式可以预测所有单数，虚拟和真实的NNLO校正。从这种精确的Parton级预测开始，并采用Geneva方法，我们使用Pythia8提供了完全淋浴和强膦的事件，同时保留了NNLO QCD的精度，以适用于在附加辐射上包含的可观察物。我们将最终预测与7 TEV的LHC数据进行比较，并找到良好的共识。
We present a new calculation for the production of isolated photon pairs at the LHC with NNLL$'_{\mathcal{T}_0}$+NNLO accuracy. This is the first implementation within the GENEVA Monte Carlo framework of a process with a nontrivial Born-level definition which suffers from QED singularities. Throughout the computation we use a smooth-cone isolation algorithm to remove such divergences. The higher-order resummation of the 0-jettiness resolution variable $\mathcal{T}_0$ is based on a factorisation formula derived within Soft-Collinear Effective Theory which predicts all of the singular, virtual and real NNLO corrections. Starting from this precise parton-level prediction and by employing the GENEVA method, we provide fully showered and hadronised events using PYTHIA8, while retaining the NNLO QCD accuracy for observables which are inclusive over the additional radiation. We compare our final predictions to LHC data at 7 TeV and find good agreement.
