Total decay width of using the infinite-order scale-setting approach based on intrinsic conformality* *Supported by the Chongqing Graduate Research and Innovation Foundation (CYB21045, ydstd1912), the Natural Science Foundation of China (12175025, 12147102), and the Fundamental Research Funds for the Central Universities (2020CQJQY-Z003, 2021CDJZYJH-003)

Abstract

We conducted a detailed study on the properties of the total decay width of the Higgs decay channel up to -order QCD corrections by using the newly suggested infinite-order scale-setting approach, which is based on both the principle of maximum conformality and intrinsic conformality. This approach is called PMC. By using the PMC approach, we observed that the conventional renormalization scale ambiguity in perturbative QCD calculation is eliminated, and the residual scale dependence due to unknown higher-order terms can also be highly suppressed. We then obtained an accurate perturbative QCD prediction on the total decay width, e.g., keV, where the errors are squared averages of those from all the mentioned error sources.