Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-18
Eur.Phys.J.C54:89-106,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 8 figures; misprints in text and tables corrected, discussion extended, references added; version accepted for publi
Scientific paper
10.1140/epjc/s10052-007-0496-z
We study different types of radiative decays involving f0(980) and a0(980) mesons within a unified ChPT-based approach at one-loop level. Light scalar resonances which are seen in pi pi, pi eta, K K-bar channels of phi(1020) radiative decays and in J/psi decays are responsible for key questions of low-energy dynamics in the strong interaction sector, and decays phi(1020) -> gamma a0(980), phi(1020) -> gamma f0(980), a0(980) -> gamma gamma, f0(980) -> gamma gamma are of interest for current experimental programs in Juelich, Frascati and Novosibirsk. From theoretical point of view it is important to verify whether light scalar mesons are members of some flavor octet or nonet. We find a value of mixing angle dictated by consistency with experiment and coupling structures of ChPT Lagrangian. Decay widths f0(980)/a0(980) -> gamma rho(770)/omega(782), which are not studied experimentally yet, are predicted. We also obtain several relations between widths, which hold independently of coupling constants and represent a fingerprint of the model.
Ivashyn S. A.
Korchin Alexander Yu.
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