We determine the 1/Nf2 and 1/Nf3 contributions to the QED beta function stemming from the closed set of nested diagrams. At the order of 1/Nf2, we discover a new logarithmic branch cut closer to the origin when compared to the 1/Nf results. The same singularity location appears at 1/Nf3, and these correspond to a UV renormalon singularity in the finite part of the photon two-point function.
Towards the QED beta function and renormalons at 1 / Nf2 and 1 / Nf3 / Dondi, N. A.; Dunne, G. V.; Reichert, M.; Sannino, F.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 102:3(2020). [10.1103/PhysRevD.102.035005]
Towards the QED beta function and renormalons at 1 / Nf2 and 1 / Nf3
Sannino F.
2020
Abstract
We determine the 1/Nf2 and 1/Nf3 contributions to the QED beta function stemming from the closed set of nested diagrams. At the order of 1/Nf2, we discover a new logarithmic branch cut closer to the origin when compared to the 1/Nf results. The same singularity location appears at 1/Nf3, and these correspond to a UV renormalon singularity in the finite part of the photon two-point function.File in questo prodotto:
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