The pp → W(→ lν) + γ process at next-to-next-to-leading order

We present details of the calculation of the pp -> W(-> l nu)gamma process at next-to-next-to-leading order in QCD, calculated using the jettiness slicing method. The calculation is based entirely on analytic amplitudes. Because of the radiation zero, the NLO QCD contribution from the gq channel is as important as the contribution from the Born qq process, disrupting the normal counting of leading and sub-leading contributions. We also assess the importance of electroweak (EW) corrections, including the EW corrections to both the six-parton channel 0 -> ud nu e+gamma g and the five-parton channel 0 -> ud nu e+gamma. Previous experimental results have been shown to agree with theoretical predictions, taking into account the large experimental errors. With the advent of run II data from the LHC, the statistical errors on the data will decrease, and will be competitive with the error on theoretical predictions for the first time. We present numerical results for s = 7 and 13 TeV. Analytic results for the one-loop six-parton QCD amplitude and the tree-level seven-parton QCD amplitude are presented in appendices.

Automated summary

The study presents the calculation of the pp -> W(-> lnugamma) process at NNLO in QCD using the jettiness slicing method, based on analytic amplitudes. It discusses the importance of NLO QCD contributions, disruption in the counting of contributions, assessment of electroweak corrections, and future competitiveness of experimental and theoretical predictions.