Light- and strange-quark mass dependence of the ρ(770) meson revisited

Journal of High Energy Physics

J. Ruiz de Elvira¹  R. Molina² 

[1] Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland;Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain;Institute of Physics of the University of Sao Paulo, Rua do Matão, 1371 -Butantã, 05508-090, São Paulo, SP, Brazil;Universidad Complutense de Madrid, Departamento de Fisica Teorica II, & IPARCOS, Plaza Ciencias, 1, 28040, Madrid, Spain;

关键词: Chiral Lagrangians;    Lattice QCD;   

DOI  :  10.1007/JHEP11(2020)017

来源: Springer

【 摘 要 】

Recent lattice data on ππ-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 ρ(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 ρ(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 ρ(770) meson is studied.

【 授权许可】

CC BY