Year: 2018
Type: article
Abstract: The 4-loop C F 3 T F n l and 5-loop C F 4 T F n l terms in the HQET field anomalous dimension γ h are calculated analytically (the 4-loop one agrees with the recent numerical result [1]). The 4-loop C F 3 T F n l and 5-loop C F 4 T F n l terms in the cusp anomalous dimension Γ(φ) are calculated analytically, exactly in φ (the φ → ∞ asymptotics of the 4-loop one agrees with the recent numerical result [2]). Combining these results with the recent 4-loop d F F n l contributions to γ h and to the small-φ expansion of Γ(φ) up to φ 4 [3], we now have the complete analytical 4-loop result for the Bloch-Nordsieck field anomalous dimension in QED, and the small-φ expansion of the 4-loop QED cusp anomalous dimension up to φ 4.
Source: Journal of High Energy Physics
Author: Andrey Grozin
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2802194261