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Anatomy of real intermediate state-subtraction scheme

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arxiv 2309.16615 v2 pith:NCVL4EWT submitted 2023-09-28 hep-ph astro-ph.CO

classification hep-phastro-ph.CO
keywords realschemesubtractiondeltaintermediatelimiton-shellstate
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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 $R(\Delta )$, where $\Delta$ measures the region around the resonance associated with the real state.

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Cited by 1 Pith paper

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  1. Resonant electromagnetic leptogenesis with coherent heavy-neutrino evolution

    hep-ph 2026-03 conditional novelty 6.0 of 10

    Resonant electromagnetic leptogenesis from TeV-scale neutrino dipole operators can reach the observed baryon asymmetry, but only with tuned mass splittings and diluted overproduction.

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