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Precise determination of the f0(500) and f0(980) parameters in dispersive analysis of the pipi data
R. Kaminski, R. Garcia-Martin, J. R. Pelaez +1
We review the use of new and precise dispersive equations, which also implement crossing symmetry, in order to shed further light on the long-standing puzzle in the parameters of t…
Scalar susceptibilities and four-quark condensates in the meson gas within Chiral Perturbation Theory
A. Gomez Nicola, J. R. Pelaez, J. Ruiz de Elvira
We analyze the properties of four-quark condensates and scalar susceptibilities in the meson gas, within finite temperature Chiral Perturbation Theory (ChPT). The breaking of the f…
Enhanced non-quark-antiquark and non-gluebal N_c behavior of light scalar mesons
Guillermo Rios, Jenifer Nebreda, Jose R. Pelaez
We report our results on the nature of the lightest scalar resonances, where we show that a quark-antiquark or glueball interpretation of the scalars f_0(600) and K^*_0(800) requir…
Determination of SU(2) Chiral Perturbation Theory low energy constants from a precise description of pion-pion scattering threshold parameters
J. Nebreda, J. R. Pelaez, G. Rios
We determine the values of the one- and two-loop low energy constants appearing in the SU(2) Chiral Perturbation Theory calculation of pion-pion scattering. For this we use a recen…