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 |
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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. |
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ISSN: | 0374-4884 1976-8524 |
DOI: | 10.3938/jkps.70.751 |