%0 Journal Article
%T Light- and strange-quark mass dependence of the rho(770) meson revisited
%A Molina, R.
%A Ruiz de Elvira, J.
%J Journal of High Energy Physics
%D 2020
%V 11
%N 11
%I Springer
%@ 1029-8479
%G English
%F Molina+RuizdeElvira2020
%O WOS:000591048300001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4615), last updated on Fri, 04 Dec 2020 08:46:23 +0000
%X Recent lattice data on pi pi -scattering phase shifts in the vector-isovector channel, pseudoscalar meson masses and decay constants for strange-quark masses smaller or equal to the physical value allow us to study the strangeness dependence of these observables for the first time. We perform a global analysis on two kind of lattice trajectories depending on whether the sum of quark masses or the strange-quark mass is kept fixed to the physical point. The quark mass dependence of these observables is extracted from unitarized coupled-channel one-loop Chiral Perturbation Theory. This analysis guides new predictions on the rho (770) meson properties over trajectories where the strange-quark mass is lighter than the physical mass, as well as on the SU(3) symmetric line. As a result, the light- and strange-quark mass dependence of the rho (770) meson parameters are discussed and precise values of the Low Energy Constants present in unitarized one-loop Chiral Perturbation Theory are given. Finally, the current discrepancy between two- and three-flavor lattice results for the rho (770) meson is studied.
%K Chiral Lagrangians
%K Lattice QCD
%R 10.1007/JHEP11(2020)017
%U https://arxiv.org/abs/2005.13584
%U https://doi.org/10.1007/JHEP11(2020)017
%P 017-74pp