2023/09/19 by Liang-Kai Wu, Han Tang, Wu, Liang-Kai +5 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #FOS: Physical sciences #Geology and Paleoclimatology Research #High Energy Physics - Lattice (hep-lat) #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.2309.10258
openalex publication_date 2023/09/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a lattice QCD determination of masses of the conjectured H-dibaryon mH at nine different temperatures T/Tc =0.24, 0.63, 0.76, 0.84, 0.95, 1.09, 1.27, 1.52, 1.90. In the meantime, the masses of baryon N, Σ, Ξ and Λ at different temperatures are also computed. The simulation is performed on anisotropic lattice with Nf=2+1 flavours of clover fermion at quark mass which corresponds to mπ=384(4) \rm MeV . The thermal ensembles were provided by the FASTSUM collaboration and the zero temperature ensembles by the Hadspec collaboration. We also calculate the spectral density of the correlation function of those particles. The spectral density distributions show rich peak structure at the lowest temperature, while at intermediate temperatures, the mass values of those particles obtained by extrapolation method reflect a two-peak structure. While the spectral density for octet baryon becomes smooth at T/Tc = 1.27, 1.52, 1.90, the spectral density for H-dibaryon becoms smooth at T/Tc = 1.90. At T/Tc =0.24 , the mass difference of H-dibaryon and Λ pair Δm = mH - 2 mΛ is estimated to be Δm = -14.6(6.2) \rm MeV which suggests there exists a bound H-dibaryon state.