TY - JOUR AU - Peláez Sagredo, José Ramón AU - Rodas, Arkaitz AU - Ruiz de Elvira Carrascal, Jacobo PY - 2021 DO - 10.1140/epjs/s11734-021-00142-9 SN - 1951-6355 UR - https://hdl.handle.net/20.500.14352/8270 T2 - European physical journal-Special topics AB - For several decades, the sigma/f(0)(500) and kappa/K*(0)(700) resonances have been subject to long-standing debate. Both their existence and properties were controversial until very recently. In this tutorial review, we compare model-independent... LA - eng PB - Springer Heidelberg KW - Pion-pion scattering KW - Rigorous absolute bounds KW - Partial-wave amplitudes KW - Bethe-salpeter approach KW - Quark-mass dependence KW - Phase-shift analysis KW - Large-Nc KW - Kpi scattering KW - K(k)over-bar scattering KW - Production mechanisms. TI - Precision dispersive approaches versus unitarized chiral perturbation theory for the lightest scalar resonances sigma/f(0)(500) and kappa/K*(0)(700) TY - journal article VL - 230 ER -