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Factorization and resummation for jet processes
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DOI：10.1007/JHEP11(2016)019.png)
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摘要
En 中文
From a detailed analysis of cone-jet cross sections in effective field theory, we obtain novel factorization theorems which separate the physics associated with different energy scales present in such processes. The relevant low-energy physics is encoded in Wilson lines along the directions of the energetic particles inside the jets. This multi-Wilson-line structure is present even for narrow-cone jets due to the relevance of small-angle soft radiation. We discuss the renormalization-group equations satisfied by these operators. Their solution resums all logarithmically enhanced contributions to such processes, including non-global logarithms. Such logarithms arise in many observables, in particular whenever hard phase-space constraints are imposed, and are not captured with standard resummation techniques. Our formalism provides the basis for higher-order logarithmic resummations of jet and other non-global observables. As a nontrivial consistency check, we use it to obtain explicit two-loop results for all logarithmically enhanced terms in cone-jet cross sections and verify those against numerical fixed-order computations.
Keyword:
Effective field theories
Perturbative QCD
Renormalization Group
Resummation
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期刊
IF:
5.5
论文数:
4.0W
被引数:
13.7W
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The dipole formalism for the calculation of QCD jet cross sections at next-to-leading order.png)
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