Abstract
Fits of pion-nucleus potentials to large sets of pionic atom data reveal departures of parameter values from the corresponding free πN 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 πN interaction when an extreme off-shell chiral model is used. The role of the size of data sets is briefly discussed.
Original language | English |
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Pages (from-to) | 979-989 |
Number of pages | 11 |
Journal | Acta Physica Polonica B |
Volume | 35 |
Issue number | 3 |
State | Published - Mar 2004 |
Event | XXVIII Mazurian Lakes Conference on Physics: Atomic Nucleus as a Laboratory for Fundamental Processes - Krzyze, Poland Duration: 31 Aug 2003 → 7 Sep 2003 |