Аннотация
The QCD/HQET matching coefficient for the heavy-quark field is calculated up to four loops. It must be finite; this requirement produces analytical results for some terms in the four-loop on-shell heavy-quark field renormalization constant which were previously only known numerically. The effect of a nonzero lighter-flavor mass is calculated up to three loops. A class of on-shell integrals with two masses is analyzed in detail. By specifying our result to QED, we obtain the relation between the electron field and the Bloch-Nordsieck field with four-loop accuracy.
Язык оригинала | английский |
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Номер статьи | 054008 |
Число страниц | 22 |
Журнал | Physical Review D |
Том | 102 |
Номер выпуска | 5 |
DOI | |
Состояние | Опубликовано - 1 сен 2020 |