2010/09/17 by N. N. Achasov, Achasov, N. N., G. N. Shestakov +1
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1009.3404
8 pages, 14 figures. The talk given by G.N. Shestakov at the International Seminar "Quarks-2010", Kolomna, Russia, June 6-12, 2010
arxiv created 2010/09/17 · openalex publication_date 2010/09/17 · arxiv updated 2010/09/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The surprising thing is that the light scalar meson problem, arising 50 years ago from the linear sigma model (LSM) with spontaneously broken chiral symmetry, has become central in the nonperturbative quantum chromodynamics (QCD), because it has been made clear that LSM could be the low energy realization of QCD. First, we review briefly signs of four-quark nature of light scalars. Then we show that the light scalars are produced in the two-photon collisions via four-quark transitions in contrast to the classic P wave tensor q q mesons that are produced via two-quark transitions γγ->q q. Thus we get new evidence of the four-quark nature of the lower scalar states.