2007/05/31 by M. Döring, M. Doring, E. Oset · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #High-pressure geophysics and materials #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.77.024602
published as Phys.Rev.C77:024602,2008 · 31 pages, 27 figures
openalex publication_date 2008/02/11 · arxiv created 2008/03/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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 \ensuremathπN scattering in 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 \ensuremathπN amplitude are included. The model can accommodate the repulsion required by phenomenological fits, though the theoretical uncertainties are bigger than previously thought. We also find an enhancement of the isovector part compatible with empirical determinations.