Extended chiral Khuri–Treiman formalism for $$\eta \rightarrow 3\pi $$ η → 3 π and the role of the $$a_0(980)$$ a 0 ( 980 ) , $$f_0(980)$$ f 0 ( 980 ) resonances

Analysis on the f 0 ( 600 ) and f 0 ( 980 ) Resonances in γγ → π + π − , π 0 π 0 Processes

We estimate the di-photon coupling of f0(600), f0(980) and f2(1270) resonances in a couple channel dispersive approach. Especially we estimate the di-photon coupling of the third sheet pole located near K̄K threshold, denoted as f III 0 (980). It is argued that this third sheet pole may be originated from a couple channel Breit-Wigner description of the f0(980) resonance. The f0(600) di-photon c...

f 1 ( 1285 ) decays into a 0 ( 980 ) π 0 , f 0 ( 980 ) π 0 and isospin breaking

Abstract We evaluate the decay width for the processes f1(1285)→ πa0(980) and f1(1285)→ πf0(980) taking into account that all three resonances are dynamically generated from the meson-meson interaction, the f1(1285) from K ∗K̄ − c.c and the a0(980), f0(980) from πη,KK̄ and ππ,KK̄ respectively. We use a triangular mechanism similar to that of the η(1405) → ππη, which provides a decay width for f1(1...

f 0 ( 500 ) , f 0 ( 980 ) , and a 0 ( 980 ) production in the χ c 1 → ηπ + π − reaction

We study the χc1 → ηπ+π− decay, paying attention to the production of f0(500), f0(980), and a0(980) from the final state interaction of pairs of mesons that can lead to these three mesons in the final state, which is implemented using the chiral unitary approach. Very clean and strong signals are obtained for the a0(980) excitation in the ηπ invariant mass distribution and for the f0(500) in th...

1 0 Ju n 20 09 A Dispersive Analysis on the f 0 ( 600 ) and f 0 ( 980 ) Resonances in γγ → π + π − , π 0 π 0 Processes

We estimate the di-photon coupling of f0(600), f0(980) and f2(1270) resonances in a coupled channel dispersive approach. The f0(600) diphoton coupling is also reinvestigated using a single channel T matrix for ππ scattering with better analyticity property, and it is found to be significantly smaller than that of a q̄q state. Especially we also estimate the di-photon coupling of the third sheet ...

2 Once more on mixing of the a 0 ( 980 ) and f 0 ( 980 ) mesons