Nuclear symmetry energy from QCD sum rules

doi:10.13538/j.1001-8042/nst.2013.05.006

Abstract

Abstract:

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.

Key words: Nuclear symmetry energy, Relativistic mean field theory, QCD sum rule, Twist-4 matrix elements

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Nuclear Science and Techniques

Nuclear symmetry energy from QCD sum rules

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