1999/05/06 by Teiji Kunihiro, Kunihiro, Teiji
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.hep-ph/9905262
Invited talk presented at the Workshop on Hadron Spectroscopy (whs99), Frascati- INFN, March 8 - 12, 1999. 8 pages with one figure
arxiv created 1999/05/06 · openalex publication_date 1999/05/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We first discuss the theoretical and phenomenological significance of the sigma meson (σ) in QCD. It is indicated that if the collective modes with the mass 500-600 MeV exists in the I=J=0 channel, various empirical facts in hadron physics can be naturally accounted for, which otherwise would remain mysterious. We propose several experiments to produce and detect the σ in nuclei using nuclear and electro-magnetic projectiles. The recent CHAOS data which show a spectral enhancement near the 2 mπ threshold in the σ channel from the reactions A(π, 2π)A' where A and A' denotes nuclei is interpreted as a possible evidence of a partial restoration of chiral symmetry in nuclei.