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Dependence on the quark masses of elastic phase shifts and light resonances within standard and unitarized Chiral Perturbation Theory
J. Nebreda, J. R. Pelaez
We study the dependence of the pion-pion scattering phase shifts on the light quark mass in both standard and unitarized SU(2) Chiral Perturbation Theory (ChPT) to one and two loop…
Chiral Perturbation Theory, the expansion and Regge behaviour determine the structure of the lightest scalar meson
J. Ruiz de Elvira, J. R. Peláez, M. R. Pennington +1
The leading behaviour of Unitarised Chiral Perturbation Theory distinguishes the nature of the and the . At one loop order the is a meson, while the…
Properties of light resonances from unitarized Chiral perturbation theory: Nc behavior and quark mass dependence
J. R. Pelaez, J. Nebreda, G. Rios
We review the unitarization of Chiral Perturbation Theory with dispersion relations and how it describes meson-meson scattering data, generating light resonances whose mass, width…
Non-factorization of four-quark condensates at low energies within Chiral Perturbation Theory
A. Gomez Nicola, J. R. Pelaez, J. Ruiz de Elvira
Four-quark correlators and the factorization hypothesis are analyzed in the meson sector within Chiral Perturbation Theory. Factorization of the four-quark condensate holds to lead…
f_0(600), kappa(800), rho(770) and K*(892), quark mass dependence from unitarized SU(3) Chiral Perturbation Theory
J. Nebreda, J. R. Pelaez
We study the strange and non-strange quark mass dependence of the parameters of the f_0(600), kappa(800), rho(770) and K*(892) resonances generated from elastic meson-meson scatter…
Strange and non-strange quark mass dependence of elastic light resonances from SU(3) Unitarized Chiral Perturbation Theory to one loop
J. Nebreda, J. R. Pelaez.
We study the light quark mass dependence of the f_0(600), kappa(800), rho(770) and K*(892) resonance parameters generated from elastic meson-meson scattering using unitarized one-l…