2008/09/10 by Yu. L. Kalinovsky, Kalinovsky, Yu. L., M. K. Volkov +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.0809.1795
6 pages, 1 figure
arxiv created 2008/09/10 · openalex publication_date 2008/09/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Two photon decays of scalar mesons f0(980), a0(980), σ(600) in the quark Nambu - Jona - Lasinio (NJL) model are calculated. The contributions of the meson loops are taken into account along with the quark loops (Hartree - Fock approximation). This corresponds to the next order of the 1/Nc expansion, where Nc=3 is the number of quark colors. It is shown that the meson and quark loops give comparable contributions to the amplitude. Moreover, in the process f0(980)-> γγthe kaon loop plays the dominant role. A similar situation takes place in the decay ϕ-> f0(980) γ\citephysrev. Our results are in satisfactory agreement with the recent experimental data.