Mauro Napsuciale

Scalar σ meson effects in ρ and ω decays into π0π0γ

Abstract The complementarity between chiral perturbation theory and the linear sigma model in the scalar channel is exploited to study π 0 π 0 production in ρ and ω radiative decays, where the effects of a low mass scalar resonance σ (500) should manifest. The recently reported data on ρ → π 0 π 0 γ seem to require the contribution of a low mass and moderately narrow σ (500). The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on ω → π 0 π 0 γ can also be accommodated in our framework, but are much less sensitive to the σ (500) properties.The complementarity between Chiral Perturbation Theory and the Linear Sigma Model in the scalar channel is exploited to study

Scalar f 0 (980) and \(\sigma (500)\) meson exchange in \(\phi\) decays into \(\pi^0\pi^0\gamma\)

\pi^0\pi^0

Chiral model for q ¯ q and q q ¯ q q mesons

production in

Spin-

\rho

{\frac{{3}}{{2}}}

and

beyond the Rarita-Schwinger framework

\omega

Chiral loops and a0(980) exchange in φ→π0ηγ

radiative decays, where the effects of a low mass scalar resonance

UA(1) SYMMETRY BREAKING AND THE SCALAR SECTOR OF QCD

\sigma(500)

Heavy baryon spin-32 theory and radiative decays of the decuplet☆

should manifest. The recently reported data on

a0(980)→γγ and f0(980)→γγ: a consistent description

\rho\to\pi^0\pi^0\gamma