Spontaneous chiral-symmetry breaking of lattice QCD with massless dynamical quarks  

作　　者：LUO XiangQian Department of Physics,School of Physics and Engineering,Sun Yat-Sen University,Guangzhou 510275,China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2007年第1期6-14,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：Supported by the Key Project of the National Natural Science Foundation of China (Grant No. 10235040);the Key Project of Ministry of Education of China (Grant No. 105135);the Project of the Chinese Academy of Sciences (Grant No. KJCX2-SW-N10);the Natural Science Foundation of Guangdong Province (Grant No. 05101821);Hong Kong Foundation of the Zhongshan University Advanced Research Center (Grant No. 06P1)

摘　　要：One of the most challenging issues in QCD is the investigation of spontaneous chiral-symmetry breaking, which is characterized by the non-vanishing chiral condensate when the bare fermion mass is zero. In standard methods of the lattice gauge theory, one has to perform expensive simulations at multiple bare quark masses, and employ some modeled functions to extrapolate the data to the chiral limit. This paper applies the probability distribution function method to computing the chiral condensate in lattice QCD with massless dynamical quarks, without any ambiguous mass extrapolation. The results for staggered quarks indicate that this might be a promising and efficient method for investigating the spontaneous chiral-symmetry breaking in lattice QCD, which deserves further investigation.One of the most challenging issues in QCD is the investigation of spontaneous chiral-symmetry breaking, which is characterized by the non-vanishing chiral condensate when the bare fermion mass is zero. In standard methods of the lattice gauge theory, one has to perform expensive simulations at multiple bare quark masses, and employ some modeled functions to extrapolate the data to the chiral limit. This paper applies the probability distribution function method to computing the chiral condensate in lattice QCD with massless dynamical quarks, without any ambiguous mass extrapolation. The results for staggered quarks indicate that this might be a promising and efficient method for investigating the spontaneous chiral-symmetry breaking in lattice QCD, which deserves further investigation.

关 键 词：lattice QCD SPONTANEOUS chiral-symmetry breaking DYNAMICAL QUARKS 

分 类 号：O572.2[理学—粒子物理与原子核物理]