The radiative decay ϕ → γππ in a coupled-channel model and the structure of f0(980)

Abstract

A coupled channel model is used to study the nature of the scalar mesons produced in the decay φ → γππ. The KK molecular picture of f 0 (980) is found to be in a good agreement with the recent experimental data from SND and CMD-2. The structure of the light scalar mesons is elucidated by investigating the S-matrix poles and the qq spectral density.

Two pion decay of the Roper resonance

“…In the present context it is also worth mentioning that the use of chiral perturbation theory [29] and its unitary extensions in coupled channels [23,24,30,31,32,33,34] has brought a new perspective on the nature of the scalar meson resonances, in particular the σ. Indeed, what is found in these works is that the σ is generated dynamically from the lowest order chiral Lagrangian and the multiple scattering of the mesons implicit in the unitary approach.…”

Radiative decay of the dynamically generated open and hidden charm scalar meson resonancesDs0*(2317)andGamermann1, Dai2, Oset3 2007Phys. Rev. C232161View full textAdd to dashboardCite

“…The procedure to evaluate the radiative decay followed here for the dynamically generated scalar resonances has been tested with success in the decays φ → f 0 (980)γ and φ → a 0 (980)γ [38][39][40] with the f 0 and a 0 resonances dynamically generated from the interaction of the lowest order mesonmeson chiral Lagrangian [41]. The present reaction is the time reversal reaction, in the charmed sector, of the radiative φ decay into a scalar and a photon.…”

Asymmetry observables ine+e−→π+π−γin theϕregion within a chiral unitar

“…The radiative decays of the φ into ππγ has been considered as one of the most suitable reactions to get information about the f 0 (980) resonance [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. In the last decade the idea that this resonance, as well as the other light scalar resonances, a 0 (980), f 0 (600) or κ(800), are dynamically generated from multiple scattering using the ordinary chiral Lagrangians [15,16,17,18] has shed new light into the problem of the nature of the scalar mesons.…”