Dreyer Frédéric A, Karlberg Alexander, Lang Jean-Nicolas, Pellen Mathieu
Clarendon Laboratory, Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Parks Road, Oxford, OX1 3PU UK.
Physik-Institut, Universität Zürich, 8057 Zurich, Switzerland.
Eur Phys J C Part Fields. 2020;80(11):1037. doi: 10.1140/epjc/s10052-020-08610-7. Epub 2020 Nov 9.
Theoretical predictions with next-to-next-to-leading order (NNLO) QCD accuracy combined with the next-to-leading order (NLO) electroweak (EW) corrections are presented for differential observables of the double-Higgs production process via vector-boson fusion. While the QCD corrections were previously known, the EW ones are computed here for the first time. The numerical results are obtained for a realistic experimental set-up at the LHC and are presented in the form of fiducial cross sections and differential distributions. Within this setup we find that the VBF approximation employed in the NNLO QCD correction is accurate at the sub-percent level. We find that the NLO EW corrections within the fiducial volume are , making them of almost the same order as the NLO QCD corrections. In some kinematic regions they can grow as large as making them the dominant radiative corrections. When the EW corrections are combined with the NNLO QCD corrections we find a total correction of . The results presented here thus comprise the state-of-the-art theoretical predicition for the double-Higgs production via vector-boson fusion, which will be of value to the high-luminosity programme at the LHC.
给出了通过矢量玻色子融合产生双希格斯粒子过程的微分可观测量的理论预测，其具有次下一个领头阶（NNLO） QCD精度并结合了次领头阶（NLO）电弱（EW）修正。虽然之前已知QCD修正，但这里首次计算了EW修正。针对大型强子对撞机（LHC）的实际实验设置获得了数值结果，并以基准截面和微分分布的形式呈现。在这种设置下，我们发现NNLO QCD修正中采用的VBF近似在亚百分比水平上是准确的。我们发现基准体积内的NLO EW修正为 ，使其与NLO QCD修正几乎处于同一量级。在某些运动学区域，它们可以增长到 ，使其成为主导的辐射修正。当将EW修正与NNLO QCD修正相结合时，我们发现总修正为 。因此，这里给出的结果构成了通过矢量玻色子融合产生双希格斯粒子的最新理论预测，这将对LHC的高亮度计划具有价值。
