Lindert Jonas M, Melnikov Kirill, Tancredi Lorenzo, Wever Christopher
Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, United Kingdom.
Institute for Theoretical Particle Physics (TTP), KIT, 76128 Karlsruhe, Germany.
Phys Rev Lett. 2017 Jun 23;118(25):252002. doi: 10.1103/PhysRevLett.118.252002. Epub 2017 Jun 22.
We compute next-to-leading order QCD corrections to the top-bottom interference contribution to H+j production at the LHC. To achieve this, we combine the recent computation of the two-loop amplitudes for gg→Hg and qg→Hq, performed in the approximation of a small b-quark mass, and the numerical calculation of the squared one-loop amplitudes for gg→Hgg and qg→Hqg, performed within OpenLoops. We find that QCD corrections to the interference are large and similar to the QCD corrections to the top-mediated Higgs production cross section. We also observe a significant reduction in the mass-renormalization scheme uncertainty once the next-to-leading order QCD prediction for the interference is employed.
我们计算了大型强子对撞机（LHC）上顶夸克 - 底夸克干涉对H + j产生的次领头阶 QCD 修正。为此，我们将在小b夸克质量近似下进行的gg→Hg和qg→Hq的两圈振幅的最新计算，与在OpenLoops中进行的gg→Hgg和qg→Hqg的一圈振幅平方的数值计算相结合。我们发现，干涉的 QCD 修正很大，并且与顶夸克介导的希格斯玻色子产生截面的 QCD 修正相似。我们还观察到，一旦采用干涉的次领头阶 QCD 预测，质量重整化方案的不确定性会显著降低。
