2026-06-08T02:45:23Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/456242023-09-07T15:10:23Zcom_20.500.14352_14col_20.500.14352_21

Quark mass dependence of light resonances and phase shifts in elastic π π and π к scattering Nebreda Manjón, Jenifer Peláez Sagredo, José Ramón 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. 2023-06-20T05:47:44Z 2023-06-20T05:47:44Z 2023-06-20T05:47:44Z 2010 book part https://hdl.handle.net/20.500.14352/45624 XXXX-XXXX 10.1063/1.3542014 eng AIP Conference Proceedings HadronPhysics2 (227431) FPA2007-29115-E FPA2008-00592 FIS2006-03438 PR34/07-15875-BSCH UCM-BSCH GR58/08 910309 open access Amer Inst Physics