Medium Effects of Low Energy Pions

E. Friedman

Medium Effects of Low Energy Pions

Nuclear Theory 2007-05-23 v1

Authors: E. Friedman

Abstract

Fits of pion-nucleus potentials to large sets of pionic atom data reveal departures of parameter values from the corresponding free $\pi N$ parameters. These medium effects can be quantitatively reproduced by a chiral-motivated model where the pion decay constant is modified in the medium or by including the empirical on-shell energy dependence of the amplitudes. No consistency is obtained between pionic atoms and the free $\pi N$ interaction when an extreme off-shell chiral model is used. The role of the size of data sets is briefly discussed.

Keywords

pion-nucleus potential pionic atoms medium effects chiral model decay constant

Cite

@article{arxiv.nucl-th/0310002,
  title  = {Medium Effects of Low Energy Pions},
  author = {E. Friedman},
  journal= {arXiv preprint arXiv:nucl-th/0310002},
  year   = {2007}
}

Comments

12 pages, 3 figures, 1 table. To appear in Acta Physica Polonica B, proceedings of XXVIII Mazurian Lakes Conference on Physics

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