Two photon decays of scalar mesons in a covariant quark model
نویسنده
چکیده
Two photon decay widths of the J = O scalar mesons a0(980), f0(980), f0(1370) and χc0 are calculated in a covariant model which is characterized by the quark antiquark structure. Previously such models were used to calculate current form factors. Here a different application is tried. A simple version of the model uses adjusted nonrelativistic model parameters with small quark masses. The results seem to prefer nonideal mixing of f0(980) and f0(1370). The calculated decay rate of χc0 agrees with the experimental results. Short title: Two photon decays of scalar mesons PACS Nos.: 12.39.Ki, 12.39.Hg, 13.20.-v, 13.25.-k E-mail: [email protected] E-mail: [email protected] 1
منابع مشابه
Identifying the quark content of the isoscalar scalar mesons f 0 ( 980 ) , f 0 ( 1370 ) , and f 0 ( 1500 ) from weak and electromagnetic processes
The assignments of the isoscalar scalar mesons f0(980), f0(1370), and f0(1500) in terms of their q̄q substructure is still a matter of heated dispute. Here we employ the weak and electromagnetic decays D+ s → f0π and f0 → γγ, respectively, to identify the f0(980) and f0(1500) as mostly s̄s, and the f0(1370) as dominantly n̄n, in agreement with previous work. The two-photon decays can be satisfacto...
متن کاملar X iv : h ep - p h / 02 12 28 1 v 1 1 9 D ec 2 00 2 Quark - Hadron Duality in Photoabsorption Sum Rules and Two Photon Decays of Meson Resonances
The idea of quark-hadron duality is developed and applied to integral sum rules for the photoexcitation of meson resonances. Some applications of the presented approach in the light and heavy quark sectors are made, and the role of the scalar diquark cluster degrees of freedom in the radiative formation of light scalar mesons is discussed.
متن کاملDecay of light scalar mesons into vector-photon and into pseudoscalar mesons
The decays of a light scalar meson into a vector meson and a photon (S → V γ) are evaluated in the tetraquark and quarkonium assignments of the scalar states. A link with the radiative decays φ → Sγ is established: experimental results for S → V γ will allow to understand if the direct, quark-loop contribution to φ→ Sγ or the kaon-loop contribution is dominant. Also strong decays S → PP -where ...
متن کاملA covariant constituent quark/gluon model for the glueball-quarkonia content of scalar-isoscalar mesons
We analyze the mixing of the scalar glueball with the scalar-isoscalar quarkonia states above 1 GeV in a non-local covariant constituent approach. Similarities and differences to the point-particle Klein-Gordon limit and to the quantum mechanical case are elaborated. Model predictions for the twophoton decay rates in the covariant mixing scheme are indicated.
متن کاملLeptonic Decays of Mesons in a Poincare- Covariant of a Quark Model
Using a relativistic constituent quark model based on point form of relativistic quantum mechanics with given set of degrees of freedom we investigate electroweak decays of the pion and ρ mesons. All free parameters of quark model (the mass u(d) -quark and parameters which determines the confinement scale) are fixed by using relevant experimental data. Leptonic Decays of Mesons in a PoincareCov...
متن کامل