Low x physics as an infinite twist (G)TMD framework: unravelling the origins of saturation
| Autor: | Taiga Altinoluk, Renaud Boussarie |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Journal of High Energy Physics, Vol 2019, Iss 10, Pp 1-25 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1029-8479 78500540 |
| DOI: | 10.1007/JHEP10(2019)208 |
| Popis: | Abstract We show how the formulations of low x physics involving Wilson line operators can be fully rewritten into an infinite twist TMD or GTMD framework, respectively for inclusive and exclusive observables. This leads to a perfect match between low x physics and moderate x formulations of QCD in terms of GTMDs, TMDs, GPDs or PDFs. We derive the BFKL limit as a kinematic limit and argue that beyond the Wandzura-Wilczek approximation, 3-body and 4-body unintegrated PFDs should be taken into account even in this regime. Finally we analyse how saturation should be understood as 3 distinct effects: saturation through non-linearities in the evolution equations at small x, saturation through multiple interactions with slow gluons as TMD gauge links, and saturation as the enhancement of genuine twist corrections. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
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