Dynamical chiral symmetry breaking and a critical mass

doi:10.1103/PhysRevC.75.015201

	Dynamical chiral symmetry breaking and a critical mass
	Chang, Lei ; Liu, Yu-Xin ; Bhagwat, Mandar S.; Roberts, Craig D.; Wright, Stewart V.
刊名	PHYSICAL REVIEW C
	2007
卷号	75 页码:8
ISSN号	0556-2813
DOI	10.1103/PhysRevC.75.015201
英文摘要	On a bounded, measurable domain of non-negative current-quark mass, realistic models of the QCD gap equation can simultaneously admit two nonequivalent dynamical chiral symmetry breaking (DCSB) solutions and a solution that is unambiguously connected with the realization of chiral symmetry in the Wigner mode. The Wigner solution and one of the DCSB solutions are destabilized by a current-quark mass, and both disappear when that mass exceeds a critical value. This critical value also bounds the domain on which the surviving DCSB solution possesses a chiral expansion. This value can therefore be viewed as an upper bound on the domain within which a perturbative expansion in the current-quark mass around the chiral limit is uniformly valid for physical quantities. For a pseudoscalar meson constituted of equal-mass current quarks, it corresponds to a mass m(0)(-)similar to 0.45 GeV. In our discussion, we employ properties of the two DCSB solutions of the gap equation that enable a valid definition of <(q) over barq > in the presence of a nonzero current mass. The behavior of this condensate indicates that the essentially dynamical component of chiral symmetry breaking decreases with increasing current-quark mass.
WOS关键词	DYSON-SCHWINGER EQUATIONS ; Q(Q)OVER-BAR BOUND-STATES ; QUANTUM CHROMODYNAMICS ; QUARK PROPAGATOR ; ASYMPTOTIC FREEDOM ; HADRON PHYSICS ; QCD ; CONFINEMENT ; MODEL ; CONVERGENCE
WOS研究方向	Physics
语种	英语
出版者	AMERICAN PHYSICAL SOC
WOS记录号	WOS:000243896000047
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/27570]
专题	中国科学院近代物理研究所
通讯作者	Chang, Lei
作者单位	1.Peking Univ, Dept Phys, Beijing 100871, Peoples R China 2.Minist Educ, Key Lab Heavy Ion Phys, Beijing 100871, Peoples R China 3.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China 4.Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA
推荐引用方式 GB/T 7714	Chang, Lei,Liu, Yu-Xin,Bhagwat, Mandar S.,et al. Dynamical chiral symmetry breaking and a critical mass[J]. PHYSICAL REVIEW C,2007,75:8.
APA	Chang, Lei,Liu, Yu-Xin,Bhagwat, Mandar S.,Roberts, Craig D.,&Wright, Stewart V..(2007).Dynamical chiral symmetry breaking and a critical mass.PHYSICAL REVIEW C,75,8.
MLA	Chang, Lei,et al."Dynamical chiral symmetry breaking and a critical mass".PHYSICAL REVIEW C 75(2007):8.