Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Hadron Structure and Spectroscopy X

HK 63.1: Gruppenbericht

Freitag, 18. März 2016, 14:00–14:30, S1/01 A4

Hyperons in nuclear matter from SU(3) chiral effective field theory — •Stefan Petschauer¹, Johann Haidenbauer², Norbert Kaiser¹, Ulf-G. Meißner^2,3, and Wolfram Weise^1,4 — ¹Technische Universität München — ²Forschungszentrum Jülich — ³Universität Bonn — ⁴ECT*, Trento, Italy

Brueckner theory is used to investigate the properties of hyperons in nuclear matter. The hyperon-nucleon interaction is taken from chiral effective field theory at next-to-leading order with SU(3) symmetric low-energy constants. Furthermore, the underlying nucleon-nucleon interaction is also derived within chiral effective field theory. We present the single-particle potentials of Λ and Σ hyperons in symmetric and asymmetric nuclear matter computed with the continuous choice for intermediate spectra. The results are in good agreement with the empirical information. In particular, our calculation gives a repulsive Σ-nuclear potential and a weak Λ-nuclear spin-orbit force. The splittings among the Σ⁺, Σ⁰ and Σ⁻ potentials have a non-linear dependence on the isospin asymmetry which goes beyond the usual parametrization in terms of an isovector Lane potential.

This work has been supported in part by DFG and NSFC (CRC110).