Abstract
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 $\ensuremath{\pi}N$ 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 $\ensuremath{\pi}N$ 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.
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