Scalar susceptibility and chiral symmetry restoration in nuclei | Zendy

G. Chanfray | Zendy; M. Ericson | Zendy; P.A.M. Guichon | Zendy

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Scalar susceptibility and chiral symmetry restoration in nuclei

Author(s) -

G. Chanfray,

M. Ericson,

P.A.M. Guichon

Publication year - 2003

Publication title -

physical review c

Language(s) - English

Resource type - Journals

eISSN - 1089-490X

pISSN - 0556-2813

DOI - 10.1103/physrevc.68.035209

Subject(s) - physics , pseudoscalar , scalar (mathematics) , quark , chiral symmetry , pion , particle physics , qcd sum rules , quantum chromodynamics , chiral symmetry breaking , quantum electrodynamics , geometry , mathematics

We study the nuclear modification of the scalar QCD susceptibility,calculated as the derivative of the quark condensate with respect to the quarkmass. We show that it has two origins. One is the low lying nuclearexcitations. At normal nuclear density this part is constrained by the nuclearincompressibility. The other part arises from the individual nucleon responseand it is dominated by the pion cloud contribution. Numerically the firstcontribution dominates. The resulting increase in magnitude of the scalarsusceptibility at normal density is such that it becomes close to thepseudoscalar susceptibility, while it is quite different in the vacuum. Weinterpret it as a consequence of chiral symmetry restoration in nuclei.Comment: 17 pages, 5 figure

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