In isospin-asymmetric nuclear matter, the three pions acquire distinct in-medium masses, wave function renormalizations, and decay constants, computed at two-loop order with in-medium chiral perturbation theory.
Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude
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abstract
Measurements of elastic scattering of 21.5 MeV pi+ and pi- by Si, Ca, Ni and Zr were made using a single arm magnetic spectrometer. Absolute calibration was made by parallel measurements of Coulomb scattering of muons. Parameters of a pion-nucleus optical potential were obtained from fits to all eight angular distributions put together. The `anomalous' s-wave repulsion known from pionic atoms is clearly observed and could be removed by introducing a chiral-motivated density dependence of the isovector scattering amplitude, which also greatly improved the fits to the data. The empirical energy dependence of the isoscalar amplitude also improves the fits to the data but, contrary to what is found with pionic atoms, on its own is incapable of removing the anomaly.
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Pion properties in isospin-asymmetric nuclear matter using in-medium chiral perturbation theory
In isospin-asymmetric nuclear matter, the three pions acquire distinct in-medium masses, wave function renormalizations, and decay constants, computed at two-loop order with in-medium chiral perturbation theory.