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We study the dependence of the ? ? scattering phase shifts on the light quark mass in both standard and unitarized SU(2) Chiral Perturbation Theory (ChPT) to one and two loops. We then use unitarized SU(3) ChPT to study the elastic f_0(600), k(8[...]texto impreso
We calculate the pion-pion elastic scattering phase shifts for pion masses from the chiral limit to values of interest for lattice studies. At low energies, we use the standard Chiral Perturbation Theory expressions to one and two loops. In addi[...]texto impreso
We study the dependence of the ? ? scattering phase shifts on the light quark mass in both standard and unitarized SU(2) Chiral Perturbation Theory (ChPT) to one and two loops. We then use unitarized SU(3) ChPT to study the elastic f(0)(600), k [...]texto impreso
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 recent and precise sum rule determination of some scattering lengths a[...]texto impreso
Carrasco, J. A. ; Nebreda Manjón, Jenifer ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2015-10-07We apply a recently developed dispersive formalism to calculate the Regge trajectories of the f_2(1270), f´_ 2(1525) and K^?(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be tr[...]texto impreso
We show that the latest and very precise dispersive data analyses require a large and very unnatural finetuning of the 1/N_c expansion at N_c = 3if the f_o(600) and K(800) light scalar mesons are to be considered predominantly q?q states, which[...]texto impreso
We study the strange and non-strange quark mass dependence of the parameters of the f_0(600), ?(800), ?(770) and K*(892) resonances generated from elastic meson-meson scattering using unitarized one-loop Chiral Perturbation Theory. We fit simult[...]texto impreso
Londergan, J. T. ; Nebreda Manjón, Jenifer ; Peláez Sagredo, José Ramón ; Szczepaniak, A. P. | Elsevier Science BV | 2014-02-05We show how the Regge trajectory of a resonance can be obtained from its pole in a scattering process and analytic constraints in the complex angular momentum plane. The method is suited for resonances that dominate an elastic scattering amplitu[...]texto impreso
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We study the light quark mass dependence of the ? ? scattering phase shifts in standard one and two-loop SU(2) Chiral Perturbation Theory (ChPT). We then repeat the study with unitarized ChPT and; furthermore, we extend the analysis to SU(3) and[...]texto impreso
Nebreda Manjón, Jenifer ; Carrasco, J. A. ; Londergan, J. T. ; Peláez Sagredo, José Ramón ; Szczepaniak, Adam P. | American Institute of Physics AIP | 2016Our results on obtaining the Regge trajectory of a resonance from its pole in a scattering process and from analytic constraints in the complex angular momentum plane are presented. The method, suited for resonances that dominate an elastic scat[...]texto impreso
We study the light quark mass dependence of the f_0(600), ?(800), ?(770), and K*(892) resonance parameters generated from elastic meson-meson scattering using unitarized one-loop chiral perturbation theory. First, we show that it is possible to [...]texto impreso
We study the light quark mass dependence of the f _0(600), ?(800), ?(770), and K*(892) resonance parameters generated from elastic meson-meson scattering using unitarized one-loop chiral perturbation theory. First, we show that it is possible to[...]texto impreso
Peláez Sagredo, José Ramón ; Hanhart, C. ; Nebreda Manjón, Jenifer ; Rios, G. | American Institute of Physics | 2010In this talk we briefly review how the unitarization of Chiral Perturbation Theory with dispersion relations can successfully describe the meson- meson scattering data and generate light resonances, whose mass, width and nature can be related to[...]
