In-medium meson properties and field transformations

Details In-medium meson properties and field transformations In-medium meson properties and field transformations

2003-03-26

arxiv.org/abs/nucl-th/0303066v2

Phys.Rev. C68 (2003) 044001

Physics

Nuclear Physics

Nuclear Theory

10 pages, using RevTeX4. More detailed discussion, references added. To be published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.68.044001

Since the existing calculations of the effective meson mass in nuclear medium involve approximations, it is important to examine whether they satisfy the general requirement of the equivalence theorem that the physical observables should be independent of the choice of field variables. We study here consequences of nucleon field transformations. As an illustrative case we consider the in-medium effective pion mass calculated for the s-wave pion-nucleon interaction in the linear density approximation. We demonstrate that it is necessary to include the Born term explicitly in order that the effective pion mass should obey the equivalence theorem.

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