On the gauge-invariance of SCET beyond leading power
Abstract We point out that the gauge-invariance of the subleading Lagrangian of soft-collinear effective theory is realised in an intricate way through momentum-conservation violating contributions. Although these terms are disregarded in diagrammatic calculations, the gauge invariance of any physic...
| 出版年: | Journal of High Energy Physics |
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| 主要な著者: | , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
SpringerOpen
2023-08-01
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| 主題: | |
| オンライン･アクセス: | https://doi.org/10.1007/JHEP08(2023)197 |
| 要約: | Abstract We point out that the gauge-invariance of the subleading Lagrangian of soft-collinear effective theory is realised in an intricate way through momentum-conservation violating contributions. Although these terms are disregarded in diagrammatic calculations, the gauge invariance of any physical transition amplitude is preserved due to the soft equations of motion. When not working with gauge-invariant building blocks, individual manifestly gauge-invariant constituent terms in the Lagrangian may give rise to gauge-dependent matrix elements starting at O $$ \mathcal{O} $$ (λ 2). Implications for a gauge-invariant definition of radiative jet functions are discussed. |
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| ISSN: | 1029-8479 |