We perform a non-perturbative lattice calculation of the P-wave pion-pion scattering phase in the rho-meson decay channel using two flavors of maximally twisted mass fermions at pion masses ranging from 480 MeV to 290 MeV. Making use of finite-size methods, we evaluate the pion-pion scattering phase in the center-of-mass frame and two moving frames. Applying an effective range formula, we find a good description of our results for the scattering phase as a function of the energy covering the resonance region. This allows us to extract the rho-meson mass and decay width and to study their quark mass dependence.
@article{arxiv.1011.5288,
title = {Resonance Parameters of the rho-Meson from Lattice QCD},
author = {Xu Feng and Karl Jansen and Dru B. Renner},
journal= {arXiv preprint arXiv:1011.5288},
year = {2015}
}
Comments
26 pages, 6 figures. v2: reference added, 1 figure added, typo corrected, published in PRD