Quark mass dependence of H-dibaryon

TL;DR

This paper investigates how the mass of the H-dibaryon depends on quark masses using pionless EFT, fitting recent lattice QCD data, and finds it is unbound at physical quark masses.

Contribution

It introduces a pionless effective field theory approach to analyze the quark mass dependence of the H-dibaryon, fitting lattice QCD results in the SU(3) limit.

Findings

H-dibaryon is unbound at physical quark masses

The EFT fits lattice QCD results in the SU(3) limit

Attractive scattering length at physical point

Abstract

The H-dibaryon is the exotic multiquark state with baryon number 2 and strangeness $-2$. The existence of the deeply bound H-dibaryon is excluded by the observation of the double hypernuclei. However the recent Lattice QCD simulations have found the bound state below the $\Lambda\Lambda$ threshold with large quark masses by HALQCD and NPLQCD collaborations. In this talk, the quark mass dependence of the H-dibaryon mass is discussed using the pionless effective field theory (EFT) where a bare H-dibaryon field is coupled with two-baryon states. We determine the parameters in this theory by fitting the recent Lattice QCD results in the SU(3) limit. As a result, we obtain the attractive scattering length at the physical point where the H-dibaryon is unbound.