Evidence for partial chiral symmetry restoration from pionic atoms

Abstract

Extensive data on strong interaction effects in pionic atoms are analyzed with a density-dependent isovector scattering amplitude suggested recently by Weise to result from a density dependence of the pion decay constant. Most of the so-called `missing s-wave repulsion' is removed when adopting this approach, thus indicating a partial chiral symmetry restoration in dense matter. The resulting potentials describe quite well also elastic scattering of 20 MeV pions on Ca. Further tests with elastic scattering are desirable.

minor revision (added references), 10 pages, 3 figures

References in corpus (5)

• Systematic calculation of s-wave pion and kaon self-energies in asymmetric nuclear matter
• Deeply bound pionic states and the effective pion mass in nuclear systems
• On the determination of the pion effective mass in nuclei from pionic atoms
• Short range correlations in the pion s-wave self-energy of pionic atoms
• S-wave $\pi$-Nucleus Repulsion and Dirac Phenomenology

Cited by in corpus (23)

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• The in-medium isovector pi N amplitude from low energy pion scattering
• Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude
• Renormalization of the isovector $\pi N$ amplitude in pionic atoms
• Density dependence of the s-wave repulsion in pionic atoms
• Simultaneous Softening of sigma and rho Mesons associated with Chiral Restoration
• Theoretical approaches to hadrons in nuclear matter
• Testing Chiral Dynamics in Pionic Atoms
• Chiral dynamics and pionic 1s states of Pb and Sn isotopes
• Testing in-medium $\pi N$ dynamics on pionic atoms
• In-medium modification of the isovector pion-nucleon amplitude
• Chiral Perturbation Theory in a Nuclear Background
• Chiral restoration from pionic atoms?
• Update on pion weak decay constants in nuclear matter
• In-medium $\Lambda$ isospin impurity from charge symmetry breaking in the ${}_{\Lambda }^4\mathrm{H}-{}_{\Lambda }^4\mathrm{He}$ mirror hypernuclei
• The s-wave repulsion and deeply bound pionic atoms: fact and fancy
• Momentum-space second-order pion-nucleus potential including medium effects in the $\Delta (1232)$ region
• Nuclear coherent ${\pi }^0$ photoproduction with charge-exchange and spin-flip rescattering
• Pionic atoms probing pi-NN resonances