Extended-soft-core Baryon-Baryon Model Esc08 II. Hyperon-Nucleon Interactions

TL;DR

This paper introduces an advanced baryon-baryon interaction model, ESC08, that accurately describes hyperon-nucleon interactions by incorporating various exchange mechanisms and quark effects, fitting experimental data well.

Contribution

The paper presents the ESC08 model, a comprehensive baryon-baryon potential including multiple exchange processes and quark effects, achieving a unified fit to NN and YN scattering data.

Findings

Successful simultaneous fit to NN and YN data with low chi-squared values.

Inclusion of quark Pauli-principle effects improves short-range interaction modeling.

Model reproduces experimental scattering results within uncertainties.

Abstract

The YN results are presented from a new version of the Extended-soft-core (ESC) potential model for Baryon-baryon (BB) scattering. The potentials consist of local- and non-local-potentials due to (i) One-boson-exchange (OBE), (ii) Pomeron and Odderon exchanges, (iii) Two pseudoscalar-exchange (PS-PS), and (iv) Meson-Pair-exchange (MPE). The OBE- and MPE-vertices are regulated by gaussian form factors, producing moderate size potentials in the origin. In addition to the mentioned ingredients of the ESC-model, also the possible short range repulsion due to the quark Pauli-principle in the BB-channels is included in the analysis. The NN, YN, and the S=-2 YY scattering is treated in a unified way using flavor SU(3) symmetry. With the ESC08-model a simultaneous fit is performed for the combined NN and YN data, using single sets of parameters. The achievement is a fit with (i) $\chi^2/NN_{data}= 1.081$, and (ii) $\chi^2/YN_{data}=1.08$.