2024
DOI: 10.21468/scipostphys.16.3.071
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EFT matching from analyticity and unitarity

Stefano De Angelis,
Gauthier Durieux

Abstract: We present a new on-shell method for the matching of ultraviolet models featuring massive states onto their massless effective field theory. We employ a dispersion relation in the space of complex momentum dilations to capture, in a single variable, the relevant analytic structure of scattering amplitudes at any multiplicity. Multivariate complex analysis and crossing considerations are therefore avoided. Remarkably, no knowledge about the infrared effective field theory is required in dimensional regularisati… Show more

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