Induced Hyperon-Nucleon-Nucleon Interactions and the Hyperon Puzzle

Roland Wirth and Robert Roth
Phys. Rev. Lett. 117, 182501 – Published 28 October 2016

Abstract

We present the first ab initio calculations for p-shell hypernuclei including hyperon-nucleon-nucleon (YNN) contributions induced by a similarity renormalization group transformation of the initial hyperon-nucleon interaction. The transformation including the YNN terms conserves the spectrum of the Hamiltonian while drastically improving model-space convergence of the importance-truncated no-core model, allowing a precise extraction of binding and excitation energies. Results using a hyperon-nucleon interaction at leading order in chiral effective field theory for lower- to mid-p-shell hypernuclei show a good reproduction of experimental excitation energies while hyperon separation energies are typically overestimated. The induced YNN contributions are strongly repulsive and we show that they are related to a decoupling of the Σ hyperons from the hypernuclear system, i.e., a suppression of the ΛΣ conversion terms in the Hamiltonian. This is linked to the so-called hyperon puzzle in neutron-star physics and provides a basic mechanism for the explanation of strong ΛNN three-baryon forces.

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  • Received 27 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.182501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Roland Wirth* and Robert Roth

  • Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt, Germany

  • *roland.wirth@physik.tu-darmstadt.de
  • robert.roth@physik.tu-darmstadt.de

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Issue

Vol. 117, Iss. 18 — 28 October 2016

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