Finite width effects in ϕradiative decays

Abstract

The decay widths ϕ\to γf_0(980) and ϕ\to γa_0(980) are calculated taking into account the finite widths of the scalar resonances f_0(980) and a_0(980). The latter are shown to be essential in order to obtain meaningful results. Simultaneously we also study the decays ϕ\to γπ^0π^0 and γπ^0ηwhere a good reproduction of the recent experimental data is obtained, pointing out the necessity of a ϕγK^0\bar{K}^0 contact vertex. The calculated decay rates to γf_0(980) and γa_0(980) are in good agreement with the experimental ones without invoking isospin breaking in the couplings of the f_0(980) and a_0(980) resonances to the K^+ K^- and K^0 \bar{K}^0 channels, at odds with recent proposals. The derived formula for calculating these ϕradiative decay widths can be also applied in their own experimental analyses in order to obtain more precise results.

20 pages, 6 figures. One reference is corrected. Version to be published in Nuclear Physics A

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Cited by in corpus (38)

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• Strong and electromagnetic decays of the light scalar mesons interpreted as tetraquark states
• Radiative decays of ϕ-meson and nature of light scalar resonances
• Chiral study of the $a_0(980)$ resonance and $\pi \eta$ scattering phase shifts in light of a recent lattice simulation
• Strong and radiative decays of the scalars f0(980) and a0(980) in a hadronic molecule approach
• Insights on scalar mesons from their radiative decays
• Lifetime of Kaonium
• Two photons into π^0π^0
• Sequential vector and axial-vector meson exchange and chiral loops in radiative phi decay
• Hunting for states in the recent LHCb di-$J/\psi$ invariant mass spectrum
• Constraint on K Kbar compositeness of the a0(980) and f0(980) resonances from their mixing intensity
• Studying the scalar bound states of the $K\bar{K}$ system in the Bethe-Salpeter formalism
• Coupling $g_{f_0{K}^{+}{K}^{-}}$ and the structure of $f_0(980)$
• Reconclining phi radiative decays with other data for a0(980), fo(980), pi-pi -> KK and pi-pi -> eta-eta
• Towards a model independent determination of the phi -> f_0 - gamma coupling
• Electron-positron annihilation into phi f_{0}(980) and clues for a new 1^{--} resonance
• ϕK^{+}K^{-} production in electron-positron annihilation
• Decay of light scalar mesons into vector-photon and into pseudoscalar mesons
• The Physics of DAFNE and KLOE
• Radiative $\varphi$ decays with derivative interactions
• The phi(1020) a0(980) S-wave scattering and hints for a new vector-isovector resonance
• Radiative decays with light scalar mesons and singlet-octet mixing in ChPT
• Investigation of $J/\psi \to \gamma {\pi }^0\eta ({\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0)$ radiative decays including final-state interactions
• Comment on "Once more about the KK molecule approach to the light scalars"
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• Decay of kaonium in a chiral approach
• KKbar molecules with momentum-dependent interactions
• Scalar mesons in radiative ϕ\to K^0\bar{K}^0γdecay
• How to prove that the LHC did not discover dark matter
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• Investigating $S$-wave bound states composed of two pseudoscalar mesons
• Radiative decays with scalar mesons a0(980) and f0(980) in Resonance Chiral Theory
• Amplitude determination for $MM\to MM$, $M=\pi ,K$ and cross-sections for $\gamma \gamma \to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0,{\pi }^0\eta$ in a chiral model
• Photo- and Electron-Production of Mesons on Nucleons and Nuclei
• Strong interaction between kaons in the reactions e+ e- --> K+ K- gamma and e+ e- --> K0 K0bar gamma