Likewise, NLO electroweak corrections have been included in the calculations. For the gluon-fusion process even the NNNLO contributions have meanwhile (2015) been calculated (Anastasiou et al., 2015). First came the confirmation of the mass of the Higgs boson: the final unknown parameter in the Standard Model. Next-to-next-to-leading order QCD corrections (NNLO) are available for the vector-boson fusion and associated WH and ZH production processes. Enormous progress has been achieved in the precision of the predictions over the past decades. For the other processes these NLO corrections are more modest and the cross sections are increased by typically 10-20%. the next-to-leading order (NLO) QCD correction for the gluon-fusion process increases the cross section by about a factor of two (LHC Higgs Cross Section Working group, 2011, 2012, 2013). Some of these corrections are large, e.g. For precise calculations, higher-order quantum corrections resulting from the strong (QCD) and the electroweak interactions need to be taken into account, in addition to the leading-order contributions shown in Figure 3. In their search for the Standard Model (SM) Higgs boson, the ATLAS and CMS Collaborations discovered a narrow bosonic particle with a mass of approximately. The cross sections are calculated in a perturbative approach based on quantum field theory. They are relevant for comparing observed event yields with the expectations for a Standard Model Higgs boson. In parallel with the experimental efforts to build the LHC and its detectors, precise theoretical calculations for the Higgs boson production cross sections have been performed (LHC Higgs Cross Section Working group, 2011, 2012, 2013). The bands display the current level of theoretical uncertainties (from LHC Higgs Cross Section Working group (2011, 2012, 2013)). For each process the included quantum corrections are indicated. 8.4 Search for ττ and b\(\bar\)H (purple)) at a centre-of-mass energy of 8 TeV.6 Strategies for Higgs boson searches at the LHC.
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