Nuclear symmetry energy from QCD sum rules

Kie Sang Jeong, Su Houng Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We calculate the nucleon self-energies in isospin-asymmetric nuclear matter using QCD sum rules. Taking the difference of these for the neutron and proton enables us to express the potential part of the nuclear symmetry energy in terms of local operators. We find that the scalar (vector) self-energy part gives a negative (positive) contribution to the nuclear symmetry energy which is consistent with the results from relativistic mean-field theories. Moreover, we find that an important contribution to the negative contribution of the scalar self-energy comes from the twist-4 matrix elements, whose leading density dependence can be extracted from deep inelastic scattering experiments. This suggests that the twist-4 contribution partly mimics the exchange of the δ meson and that it constitutes an essential part in the origin of the nuclear symmetry energy from QCD. Our result also extends an early success of QCD sum-rule method in understanding the symmetric nuclear matter in terms of QCD variables to the asymmetric nuclear matter case.

Original languageEnglish
Article number015204
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number1
DOIs
Publication statusPublished - 2013 Jan 22

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sum rules
quantum chromodynamics
symmetry
energy
scalars
inelastic scattering
mesons
neutrons
operators
protons
matrices

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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abstract = "We calculate the nucleon self-energies in isospin-asymmetric nuclear matter using QCD sum rules. Taking the difference of these for the neutron and proton enables us to express the potential part of the nuclear symmetry energy in terms of local operators. We find that the scalar (vector) self-energy part gives a negative (positive) contribution to the nuclear symmetry energy which is consistent with the results from relativistic mean-field theories. Moreover, we find that an important contribution to the negative contribution of the scalar self-energy comes from the twist-4 matrix elements, whose leading density dependence can be extracted from deep inelastic scattering experiments. This suggests that the twist-4 contribution partly mimics the exchange of the δ meson and that it constitutes an essential part in the origin of the nuclear symmetry energy from QCD. Our result also extends an early success of QCD sum-rule method in understanding the symmetric nuclear matter in terms of QCD variables to the asymmetric nuclear matter case.",
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Nuclear symmetry energy from QCD sum rules. / Jeong, Kie Sang; Lee, Su Houng.

In: Physical Review C - Nuclear Physics, Vol. 87, No. 1, 015204, 22.01.2013.

Research output: Contribution to journalArticle

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