TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.16.3.071
TI  - EFT matching from analyticity and unitarity
PY  - 2024/03/12
UR  - https://www.scipost.org/SciPostPhys.16.3.071
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 16
IS  - 3
SP  - 071
A1  - De Angelis, Stefano
AU  - Durieux, Gauthier
AB  - 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 regularisation. All matching information is extracted from the residues and iscontinuities of the ultraviolet scattering amplitudes, which unitarity expresses in terms of lower-point and lower-loop results, respectively. This decomposition into simpler building blocks could deliver new insight in the structure of the effective field theories obtained from classes of ultraviolet scenarios and facilitate computations at higher loop orders.
ER  -

@Article{10.21468/SciPostPhys.16.3.071,
	title={{EFT matching from analyticity and unitarity}},
	author={Stefano De Angelis and Gauthier Durieux},
	journal={SciPost Phys.},
	volume={16},
	pages={071},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.16.3.071},
	url={https://scipost.org/10.21468/SciPostPhys.16.3.071},
}