Nuclear symmetry energy from QCD sum rules  

Nuclear symmetry energy from QCD sum rules

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作  者:JEONG Kie Sang LEE Su Houng 

机构地区:[1]Institute of Physics and Applied Physics,Yonsei University

出  处:《Nuclear Science and Techniques》2013年第5期31-33,共3页核技术(英文)

基  金:Supported by Korea national researchfoundation(Grants Nos.KRF-2011-0030621 and KRF-2011-0020333)

摘  要:We calculated the nucleon self-energies in iso-spin asymmetric nuclear matter and obtained the nuclear symmetry energy by taking difference of these of neutron and proton.We find that the scalar(vector) self-energy part gives a negative(positive) contribution to the nuclear symmetry energy,consistent with the result from relativistic mean-field theories.Also,we found exact four-quark operator product expansion for nucleon sum rule.Among them,twist-4 matrix elements which can be extracted from deep inelastic scattering experiment constitute an essential part in the origin of the nuclear symmetry energy from QCD.Our result also extends early success of QCD sum rule in the symmetric nuclear matter to the asymmetric nuclear matter.We calculated the nucleon self-energies in iso-spin asymmetric nuclear matter and obtained the nuclear symmetry energy by taking difference of these of neutron and proton. We find that the scalar (vector) self-energy part gives a negative (positive) contribution to the nuclear symmetry energy, consistent with the result from relativistic mean-field theories. Also, we found exact four-quark operator product expansion for nucleon sum rule. Among them, twist-4 matrix elements which can be extracted from deep inelastic scattering experiment constitute an essential part in the origin of the nuclear symmetry energy from QCD. Our result also extends early success of QCD sum rule in the symmetric nuclear matter to the asymmetric nuclear matter.

关 键 词:QCD求和规则 对称能 非对称核物质 相对论平均场理论 核电 矩阵元素 散射实验 对称性 

分 类 号:O572.243[理学—粒子物理与原子核物理] O572[理学—物理]

 

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