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00925njm 22002777a 4500 dc Nebreda Manjón, Jenifer author Peláez Sagredo, José Ramón author 2010 We study the light quark mass dependence of the π π 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 generate the elastic f_0(600), к(800) ρ(770) and K*(892) resonances from unitarization. The quark masses are varied up to values of interest for lattice studies. We find that the SU(2) π π phase shifts both in standard and unitarized ChPT depend very softly on the pion mass and that our results are in fair agreement with lattice results in the I=2, J=0 channel. In the SU(3) amplitudes, the mass and width of the ρ (770) and K*(892) present an analogous and smooth quark mass dependence. In contrast, both scalars present a similar non-analyticity at high quark masses. We also confirm the lattice assumption of independence of the vector two-meson coupling on the quark mass, that is, nevertheless, violated for scalars. 978-0-7354-0878-4 10.1063/1.3542014 https://hdl.handle.net/20.500.14352/45624 http://dx.doi.org/10.1063/1.3542014 http://scitation.aip.org Quark mass dependence of light resonances and phase shifts in elastic π π and π к scattering