TY  - JOUR
AU  - Molina, R.
AU  - Ruiz de Elvira, J.
PY  - 2020
DA  - 2020//
TI  - Light- and strange-quark mass dependence of the rho(770) meson revisited
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 017
EP  - 74pp
VL  - 11
IS  - 11
PB  - Springer
KW  - Chiral Lagrangians
KW  - Lattice QCD
AB  - 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.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2005.13584
UR  - https://doi.org/10.1007/JHEP11(2020)017
DO  - 10.1007/JHEP11(2020)017
LA  - English
N1  - WOS:000591048300001
ID  - Molina+RuizdeElvira2020
ER  -