RT Journal Article
T1 Quark-mass dependence of the ρ and σ mesons from dispersion relations and chiral perturbation theory
A1 Hanhart, Christoph
A1 Peláez Sagredo, José Ramón
A1 Rios, G.
AB We use the one-loop chiral perturbation theory π π -scattering amplitude and dispersion theory in the form of the inverse amplitude method to study the quark-mass dependence of the two lightest resonances of the strong interactions, the f_0(600) (σ) and the ρ meson. As the main results, we find that the rho π π coupling constant is almost quark mass independent and that the ρ mass shows a smooth quark-mass dependence while that of the σ shows a strong nonanalyticity. These findings are important for studies of the meson spectrum on the lattice.
PB American Physical Society
SN 0031-9007
YR 2008
FD 2008-03
LK https://hdl.handle.net/20.500.14352/51707
UL https://hdl.handle.net/20.500.14352/51707
LA eng
NO ©2008 The American Physical Society.We thank G. Colangelo, S. Du¨rr, V. V. Flambaum, U. G. Meißner, and A. Rusetsky for their useful comments.
DS Docta Complutense
RD 6 abr 2025