2022/10/20 by O. P. Solovtsova, Solovtsova, O. P., V. I. Lashkevich +3 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2210.11071
openalex publication_date 2022/10/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The contributions to the anomalous magnetic moment of the lepton L (L=e , μ or τ) generated by a specific class of QED diagrams are evaluated analytically up to the eighth order of the electromagnetic coupling constant. The considered class of the Feynman diagrams involves the vacuum polarization insertions into the electromagnetic vertex of the lepton L up to three closed lepton loops. The corresponding analytical expressions are obtained as functions of the mass ratios r=ml/mL in the whole region 0 < r < ∞. Our consideration is based on a combined use of the dispersion relations for the polarization operators and the Mellin-Barnes integral transform for the Feynman parametric integrals. This method is widely used in the literature in multi-loop calculations in relativistic quantum field theories. For each order of the radiative correction, we derive analytical expressions as functions of r, separately at r<1 and r>1. We argue that in spite of the obtained explicit expressions in these intervals which are quite different, at first glance, they represent two branches of the same analytical function. Consequently, for each order of corrections there is a unique analytical function defined in the whole range of~r∈ (0,∞). The results of numerical calculations of the 4th, 6th and 8th order corrections to the anomalous magnetic moments of leptons (L=e ,μ, τ) with all possible vacuum polarization insertions are represented as functions of the ratio r=ml/mL. Whenever pertinent, we compare our analytical expressions and the corresponding asymptotic expansions with the known results available in the literature.