Pion parameters in nuclear medium from chiral perturbation theory and virial expansion

Details Pion parameters in nuclear medium from chiral perturbation theory and virial expansion Pion parameters in nuclear medium from chiral perturbation theory and virial expansion

2003-09-11

arxiv.org/abs/nucl-th/0309027v1

Phys.Rev. C69 (2004) 015204

Physics

Nuclear Physics

Nuclear Theory

9 Pages RevTex, 3 eps figures

Scientific paper

10.1103/PhysRevC.69.015204

We consider two methods to find the effective parameters of the pion traversing a nuclear medium. One is the first order chiral perturbation theoretic evaluation of the pion pole contribution to the two-point function of the axial-vector current. The other is the exact, first order virial expansion of the pion self-energy. We find that, although the results of chiral perturbation theory are not valid at normal nuclear density, those from the virial expansion may be reliable at such density. The latter predicts both the mass-shift and the in-medium decay width of the pion to be small, of about a few MeV.

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