Masses of the conjectured H-dibaryon at different temperatures  

作　　者：Liang-Kai Wu Han Tang Ning Li Xin-Yang Wang 吴良凯;汤涵;李宁;王昕杨

机构地区：[1]School of Physics and Electronic Engineering,Jiangsu University,Zhenjiang 212013,China [2]Center for Fundamental Physics,School of Mechanics and Physics,Anhui University of Science and Technology,Huainan 232001,China

出　　处：《Chinese Physics C》2024年第8期83-93,共11页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(NSFC)(11347029)。

摘　　要：We present a lattice QCD determination of masses of the conjectured H-dibaryon,denoted as mH,at nine different temperatures:T/T_(c)=0.24,0.63,0.76,0.84,0.95,1.09,1.27,1.52,and 1.90.The masses of baryons N,Σ,Ξ,andΛat different temperatures were also computed.The simulations were performed on an anisotropic lattice with N_(f)=2+1 flavours of clover fermion at a quark mass corresponding to mπ=384(4)MeV.The thermal ensembles were provided by the FASTSUM collaboration,whereas the zero temperature ensembles were provided by the Hadspec collaboration.We also calculated the spectral density of the correlation function of those particles.The spectral density distributions show a rich peak structure at the lowest temperature;at intermediate temperatures,the mass values of those particles obtained by the extrapolation method reflect a two-peak structure.While the spectral density for the octet baryon becomes smooth at T/T_(c)=1.27,1.52,and 1.90,the spectral density for the H-dibaryon becomes smooth at T/T_(c)=1.90.At T/T_(c)=0.24,the mass difference of the H-dibaryon andΛpair,expressed asΔm=m_(H)−2m_(Λ),was estimated to beΔm=−14.6(6.2)MeV,which suggests the existence of a bound H-dibaryon state.

关 键 词：lattice QCD H-DIBARYON spectral function clover fermion finite temperature 

分 类 号：O572.243[理学—粒子物理与原子核物理]