Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP11(2020)017
Keywords
Chiral Lagrangians; Lattice QCD
Categories
Funding
- Fundacao de amparoa pesquisa do estado de Sao Paulo (FAPESP)
- Talento Program of the Community of Madrid
- Complutense University of Madrid [2018-T1/TIC-11167]
- CIDEGENT program [CIDEGENT/2019/015]
- European Union [824093]
- Swiss National Science Foundation [PZ00P2 174228]
- [PID2019-106080GB-C21]
- Swiss National Science Foundation (SNF) [PZ00P2_174228] Funding Source: Swiss National Science Foundation (SNF)
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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.
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