ar X iv : h ep - p h / 06 12 05 2 v 1 5 D ec 2 00 6 Dispersive chiral approach to Meson - meson dynamics : Spectroscopy results for light scalars and precision studies

ar X iv : h ep - p h / 06 12 12 1 v 1 1 1 D ec 2 00 6 Heavy meson semileptonic decays in two dimensions in the large N c

We study QCD in 1 + 1 dimensions in the large Nc limit using light-front Hamiltonian perturbation theory in the 1/Nc expansion. We use this formalism to exactly compute hadronic transition matrix elements for arbitrary currents at leading order in 1/Nc, which we use to write the semileptonic differential decay rate of a heavy meson and its moments. We then compare with the results obtained usin...

ar X iv : h ep - p h / 03 10 23 7 v 1 2 0 O ct 2 00 3 Large N c behavior of light resonances in meson - meson scattering

By scaling the parameters of meson-meson unitarized Chiral Perturbation Theory amplitudes according to the QCD large N c rules, one can study the spectroscopic nature of light meson resonances. The scalars σ , κ f 0 (980) and, possibly, the a 0 (980) do not seem to behave as ¯ qq states, in contrast to the vectors ρ(770) and K * (892). The behavior shown by the scalars is naturally explained in...

ar X iv : h ep - p h / 04 12 14 0 v 2 1 6 D ec 2 00 4 Charm meson resonances in D → P l ν decays

Motivated by recent experimental results we reconsider semileptonic D → P ℓν ℓ decays within a model which combines heavy quark symmetry and properties of the chiral Lagrangian. We include all observed charm meson resonances in our Lagrangian and determine their impact on the charm meson semileptonic form factors. We find that the inclusion of recently discovered charm resonances in the model l...

ar X iv : h ep - p h / 06 11 27 1 v 2 2 2 N ov 2 00 6 Structure of the axial - vector meson D s 1 ( 2460 )

ar X iv : h ep - p h / 06 11 27 1 v 1 2 1 N ov 2 00 6 Structure of the axial - vector meson D s 1 ( 2460 )