Interesting features of scalar and pseudoscalar spectral function sum rules within a U(3) chiral framework
1 Department of Physics, Hebei Normal University, 050024 Shijiazhuang, P. R. China
2 Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain
3 Departamento de Física Teórica II, Universidad Complutense de Madrid, E-28040 Madrid, Spain
We compute the scalar and pseudoscalar spectral functions by using their form factors calculated within the unitarized U(3) chiral perturbation theory (χPT). The extrapolation to larger values of NC and the spectral function sum rules are discussed as well. Some interesting features of the scalar spectral functions are revealed.
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