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The in-medium isovector pi N amplitude from low energy pion scattering

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arxiv nucl-ex/0404031 v2 pith:4HUKOPMX submitted 2004-04-26 nucl-ex

classification nucl-ex
keywords atomsenergypionpionicrepulsionscatteringaccountedacross
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Differential cross sections for elastic scattering of 21.5 MeV positive and negative pions by Si, Ca, Ni and Zr have been measured as part of a study of the pion-nucleus potential across threshold. The `anomalous' repulsion in the s-wave term was observed, as is the case with pionic atoms. The extra repulsion can be accounted for by a chiral-motivated model where the pion decay constant is modified in the medium. Unlike in pionic atoms, the anomaly cannot be removed by merely introducing an empirical on-shell energy dependence.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Pion properties in isospin-asymmetric nuclear matter using in-medium chiral perturbation theory

    nucl-th 2025-07 conditional novelty 6.0 of 10

    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.

  2. Valence quark distribution of the pion inside a medium with finite baryon density: A Nambu--Jona-Lasinio model approach

    hep-ph 2025-12 unverdicted novelty 5.0 of 10

    The authors use the two-flavor NJL model to obtain medium-modified constituent quark masses and then compute the in-medium pion electromagnetic form factor, distribution amplitude, and parton distribution function via...

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