$\Lambda\Lambda$ interaction and hypernuclei

TL;DR

This paper extends the Bonn-Jülich baryon-baryon interaction models to the S=-2 sector, specifically to describe $ abla ext{L} ext{L}$ hypernuclei, and finds reasonable agreement with experimental data.

Contribution

It constructs an S=-2 baryon-baryon interaction based on existing potentials and successfully describes $ abla ext{L} ext{L}$ hypernuclei masses, extending the model to new strangeness sector.

Findings

Masses of $ abla ext{L} ext{L}$ hypernuclei agree with experimental data

Extended Bonn-Jülich potentials to S=-2 sector at low energies

Inclusion of correlations improves hypernuclei mass predictions

Abstract

Data on $\Lambda\Lambda$ hypernuclei provide a unique method to learn details about the strangeness S =- 2 sector of the baryon-baryon interaction. From the free space Bonn-J\"ulich potentials, determined from data on baryon-baryon scattering in the S = 0, -1 channels, we construct an interaction in the S =-2 sector to describe the experimentally known LL hypernuclei. After including short-range (Jastrow) and RPA correlations, we find masses for these LL hypernuclei in a reasonable agreement with data, taking into account theoretical and experimental uncertainties. Thus, we provide a natural extension, at low energies, of the Bonn-J\"ulich one-boson exchange potentials to the S =-2 channel.