The continuum spectrum of hypernuclear trios

The spectrum of hypernuclear trios composed of a Λ baryon and two nucleons is the subject of an ongoing experimental campaign, aiming to study the interaction of the Λ particle with a neutron, and the 3-body Λ-nucleon-nucleon force. In this manuscript we utilize baryonic effective field theory at le...

Full description

Saved in:
Bibliographic Details
Published inPhysics letters. B Vol. 808; p. 135614
Main Authors Schäfer, M., Bazak, B., Barnea, N., Mareš, J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.09.2020
Elsevier
Subjects
Effective field theory
Hypernuclei
Hypertriton
Resonance
Λnn
Hypernuclei
Resonance
Hypertriton
Effective field theory
Λnn
Online AccessGet full text
ISSN0370-2693
1873-2445
DOI10.1016/j.physletb.2020.135614

Cover

More Information
Summary:The spectrum of hypernuclear trios composed of a Λ baryon and two nucleons is the subject of an ongoing experimental campaign, aiming to study the interaction of the Λ particle with a neutron, and the 3-body Λ-nucleon-nucleon force. In this manuscript we utilize baryonic effective field theory at leading order, constrained to reproduce the available low energy light hypernuclear data, to study the continuum spectrum of such hypernuclear trios. Using the complex scaling method and the inverse analytic continuation in the coupling constant method we find the existence of a virtual state in the ΛnpJπ=3/2+ channel, leading to cross-section enhancement near threshold. For the ΛnnJπ=1/2+ channel we predict a resonance state. Depending, however, on the value of the ΛN scattering length, the resonance pole moves from the physical to the unphysical complex energy sheet within the experimental bounds.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2020.135614