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Derivation of the Cross-Free Family representation for the box diagram

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arxiv 2311.14374 v2 pith:OD245RA6 submitted 2023-11-24 hep-ph hep-th

Zeno Capatti This is my paper
classification hep-phhep-th
keywords diagramrepresentationcross-freederivationfamilybrieflydetaildifferences
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I work out in full detail the derivation of the Cross-Free Family (CFF) representation for the box diagram, and highlight the differences with its Time Ordered Perturbation Theory (TOPT) representation. I briefly discuss implications for the threshold singularity structure of the diagram.

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