Loop amplitudes in gauge theories: modern analytic approaches

Ruth Britto

Loop amplitudes in gauge theories: modern analytic approaches

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arxiv 1012.4493 v2 pith:TZLILH6B submitted 2010-12-20 hep-th hep-ph

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keywords amplitudesanalyticlooptechniquestheoriesunitarityapproachesarticle

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This article reviews on-shell methods for analytic computation of loop amplitudes, emphasizing techniques based on unitarity cuts. Unitarity techniques are formulated generally but have been especially useful for calculating one-loop amplitudes in massless theories such as Yang-Mills theory, QCD, and QED.

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The EFT Bootstrap at Finite $M_{PL}$
hep-th 2025-01 conditional novelty 7.0 of 10

One-loop gravity effects make forward-limit positivity bounds ill-defined for massless scalar-gravity EFTs, forcing non-forward dispersion relations that shift the tree-level bounds by order-one factors.

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