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

Science China(Physics,Mechanics & Astronomy) 2007年第1期50卷 6-14页

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

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

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Density Dependence of the Mass and Decay Constant of Pion in Nuclear Matter in the Dyson-Schwinger Equation Approach of QCD

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Chinese Physics Letters 2005年第1期22卷 46-49页

作者：刘玉鑫巢静宜常雷袁玮 DepartmentofPhysics PekingUniversityBeijing100871 DepartmentofPhysics PekingUniversityBeijing100871//KeyLaboratoryofHeavyIonPhysics(MinistryofEducation)PekingUniversityBeijing100871//InstituteofTheoreticalPhysicsChineseAcademyofSciencesBeijing100080

With the Dyson--Schwinger equation formalism at finite chemical potential, we study the density dependence of the mass and decay constant of pion in nuclear matter. The calculated results indicate that both the mass and the decay constant remain almost constant at small chemical potential. As the chemical potential gets quite large, the decay constant increases and the mass decreases with the increasing of the chemical potential, and both of them vanish suddenly as a critical value is reached.

关键词： COLOR symmetry MODEL QUARK-MODEL chiral-symmetry FIELD-THEORY SCATTERING SOLITONS MESONS RADIUS Solitons field theory (physics) Scattering Neutron Matter Chemical potential pi-Mesons Decay Density dependence Mesons quantum chromodynamics quark models Constants chiral symmetries decay COLOR MODEL

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