ar X iv : h ep - p h / 04 05 12 8 v 1 1 4 M ay 2 00 4 Propagators of light scalar mesons

ar X iv : h ep - p h / 04 05 22 8 v 1 2 4 M ay 2 00 4 Unitary chiral dynamics in J / Ψ → V PP decays and the role of scalar mesons

We make a theoretical study of the J/Ψ decays into ωππ, φππ, ωKK̄ and φKK̄ using the techniques of the chiral unitary approach stressing the important role of the scalar resonances dynamically generated through the final state interaction of the two pseudoscalar mesons. We also discuss the importance of new mechanisms with intermediate exchange of vector and axial-vector mesons and the role playe...

ar X iv : h ep - p h / 04 05 11 9 v 1 1 3 M ay 2 00 4 The Lorentz and CPT violating effects on the charged

ar X iv : h ep - p h / 04 05 03 9 v 1 5 M ay 2 00 4 η , η ′ → π + π − γ with coupled channels

ar X iv : h ep - p h / 04 01 03 7 v 1 8 J an 2 00 4 Large Nc Behavior of Light Scalar Meson Nonet

We study whether light scalar meson nonet can survive in large values of Nc through observing how scattering amplitudes behave as Nc increases from 3 within a unitarized chiral approach. We obtain the result that vector mesons such as ρ and K∗ survive as narrow width resonances, but all of the scalar meson nonet below 1 GeV fade out as Nc exceeds a rather small number about 6.

ar X iv : h ep - p h / 02 05 01 6 v 1 2 M ay 2 00 2 Scalar a 0 ( 980 ) meson in φ → π 0 ηγ decay