Anatomy of real intermediate state-subtraction scheme

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Sammanfattning

We study the origin of the real intermediate state subtraction problem and compare its different solutions. We show that the ambiguity in subtraction schemes arises from the on-shell approximation for the 2-point functions that reduces the Schwinger-Dyson equations to the Boltzmann limit. We also suggest a new subtraction scheme which, unlike the earlier definitions, never leads to negative scattering rates. This scheme also quantifies the validity of the on-shell limit in terms of an effective one-particle weight function R(Δ), where Δ measures the region around the resonance associated with the real state.
Originalspråkengelska
Artikelnummer096034
TidskriftPhysical Review D
Volym108
Nummer9
Antal sidor10
ISSN2470-0010
DOI
StatusPublicerad - 29 nov. 2023
MoE-publikationstypA1 Tidskriftsartikel-refererad

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