Flavor structure of the baryon-baryon interaction from lattice QCD

TL;DR

This study uses lattice QCD simulations to analyze baryon-baryon interactions, revealing flavor-spin dependent potentials and discussing implications for the H-dibaryon resonance.

Contribution

It provides the first detailed lattice QCD analysis of flavor and spin dependence in baryon-baryon potentials with full 3-flavor QCD.

Findings

Strong repulsive core in flavor-octet, spin-singlet channel

Attractive core in flavor singlet channel

Possible H-dibaryon resonance above Lambda-Lambda threshold

Abstract

We investigate baryon-baryon (BB) interactions in the 3-flavor full QCD simulations with degenerate quark masses for all flavors. The BB potentials in the orbital S-wave are extracted from the Nambu-Bethe-Salpeter wave functions measured on the lattice. We observe strong flavor-spin dependences of the BB potentials at short distances. In particular, a strong repulsive core exists in the flavor-octet and spin-singlet channel(the 8_s representation), while an attractive core appears in the flavor singlet channel (the 1 representation). We discuss the relation of such flavor-spin dependence with the Pauli exclusion principle at the quark level. The possible existence of an H-dibaryon resonance above the Lambda-Lambda threshold is also discussed.