6533b7d9fe1ef96bd126c1b0
RESEARCH PRODUCT
s-wave pion-nucleus optical potential
Eulogio OsetM. Döringsubject
Nuclear and High Energy PhysicsParticle physicsscattering amplitude [pi nucleon]Nuclear Theorymedia_common.quotation_subjectIsoscalarpartial waveNuclear TheoryFOS: Physical sciencesAsymmetryrenormalizationNuclear physicsNuclear Theory (nucl-th)symbols.namesakePionPauli exclusion principlemesic atom [deuterium]unitarityddc:530higher-order [Feynman graph]nuclear reaction [pi nucleus]numerical calculationsNuclear Experimentmedia_commonPhysicschiral [symmetry]UnitarityIsovectorN(1440)FísicaNuclear mattermesic atom [hydrogen]propagator [pi]Scattering amplitudenuclear mattersymbolsoptical [potential]correction [vertex function]description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-05-21 |