Observations on spontaneous chiral symmetry breaking and the mass gap of QCD in finite volume  

作　　者：Xiaolan Meng Bolun Hu Yi-Bo Yang 

机构地区：[1]University of Chinese Academy of Sciences,School of Physical Sciences,Beijing 100049,China [2]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China [4]International Centre for Theoretical Physics Asia-Pacific,Beijing/Hangzhou,China

出　　处：《Communications in Theoretical Physics》2024年第9期42-47,共6页理论物理通讯（英文版）

基　　金：supported in part by NSFC Grant Nos.12293060,12293062,12293065 and 12047503;the science and education integration young faculty project of the University of Chinese Academy of Sciences,the Strategic Priority Research Program of the Chinese Academy of Sciences,Grant Nos.XDB34030303 and YSBR-101;NSFC-DFG joint grant under Grant Nos.12061131006 and SCHA 458/22。

摘　　要：We present a lattice quantum chromodynamics(QCD)simulation with 2+1+1 flavor full QCD ensembles using near-physical quark masses and different spatial sizes L,at a~0.055 fm.The results show that the scalar and pesudoscalar 2-point correlator with a valence pion mass of approximately 230 MeV become degenerated at L≤1.0 fm,and such an observation suggests that the spontaneous chiral symmetry breaking disappears effectively at this point.At the same time,the mass gap between the nucleon and pion masses remains larger thanΛQCDin the entire L∈[0.2,0.7]fm range.

关 键 词：lattice QCD chiral symmetry breaking CONFINEMENT 

分 类 号：O572.243[理学—粒子物理与原子核物理]