Role of unitarity in EFT descriptions of low-energy NN scattering

Cut-off regulators in the effective field theory (EFT) description of a low-energy NN scattering often violates unitarity. To understand the phenomenological consequences of such a violation of unitarity, we have performed a comparative study for the 1S0 np scattering up to next-to-leading order wit...

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Veröffentlicht in:Journal of the Korean Physical Society 2017, 70(8), , pp.751-757
Hauptverfasser: In, Eun Jin, Park, Tae-Sun, Hong, Seung-Woo
Format: Artikel
Sprache:eng
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Zusammenfassung:Cut-off regulators in the effective field theory (EFT) description of a low-energy NN scattering often violates unitarity. To understand the phenomenological consequences of such a violation of unitarity, we have performed a comparative study for the 1S0 np scattering up to next-to-leading order with five different forms of regulators, some of which preserve unitarity while others do not. For this aim, we have considered two different types of EFTs; one is the EFT that consists of only nucleonic degrees of freedom, and the other is the EFT with a dibaryon field. For both types of EFTs, unitarity-preserving regulators turn out generally to produce phase shifts in better agreement with the data than unitarity-violating regulators do.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.70.751