The s-wave pion-nucleus optical potential

Details The s-wave pion-nucleus optical potential The s-wave pion-nucleus optical potential

2007-05-21

arxiv.org/abs/0705.3027v2

Phys.Rev.C77:024602,2008

Physics

Nuclear Physics

Nuclear Theory

31 pages, 27 figures

Scientific paper

10.1103/PhysRevC.77.024602

We calculate the s-wave part of the pion-nucleus optical potential using a unitarized chiral approach that has been previously used to simultaneously describe pionic hydrogen and deuterium data as well as low energy pi N scattering in the vacuum. This energy dependent model allows for additional isoscalar parts in the potential from multiple rescattering. We consider Pauli blocking and pion polarization in an asymmetric nuclear matter environment. Also, higher order corrections of the pi N amplitude are included. The model can accommodate the repulsion required by phenomenological fits, though the theoretical uncertainties are bigger than previously thought. At the same time, we also find an enhancement of the isovector part compatible with empirical determinations.

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