Assessment of systematic theory uncertainties in IAM unitarization



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Escudero Pedrosa, Juan and Llanes Estrada, Felipe José and Oller, Jose Antonio and Salas Bernárdez, Alexandre (2021) Assessment of systematic theory uncertainties in IAM unitarization. Nuclear and particle physics proceedings, 312 . pp. 82-86. ISSN 2405-6014

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Effective Field Theories (EFTs) for Goldstone Boson scattering at a low order allow the computation of near-threshold observables in terms of a few coefficients arranged by a counting. As a matter of principle they should make sense up to an energy scale E similar to 4 pi F but the expansion in powers of momentum violates exact elastic unitarity and renders the derivative expansion unreliable at much lower energies. If new-physics deviations from the Standard Model are found and encoded in low-energy coefficients, perhaps at the LHC, it will be profitable to extend the reach of the EFT to regimes where partial waves are saturating unitarity. The methods known in hadron physics as "Unitarized Chiral Perturbation Theory" extend the EFT up to its nominal reach or up to the first new physics resonance or structure (if found below that energy reach) in the partial wave amplitude, but they usually have unknown uncertainties. We recapitulate our analysis of the systematic theory uncertainties of the well known Inverse Amplitude Method (IAM).

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© 2021 Elsevier
We thank Prof. S. Narison and his Montpellier CNRS team for providing, year after year, a venue for discussion of new results in the strong interactions and QCD, and especially for preparing it fully online under this year's conditions. We acknowledge support by EU Horizon 2020 research and innovation programme, STRONG-2020 project, grant agreement No 824093; grants FEDER (EU) and MINECO/MICINN (Spain) FPA2016-75654-C2-1-P and -77313-P, PID2019 108655GB-I00, -106080GB-C21 (Spain) -106080GBC22; Universidad Complutense de Madrid under research group 910309 and the IPARCOS institute; and the VBSCan COST Action CA16108.

Uncontrolled Keywords:Chiral perturbation theory; Scattering; Pion
Subjects:Sciences > Physics
ID Code:68303
Deposited On:12 Nov 2021 19:23
Last Modified:15 Nov 2021 09:47

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