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Resonance Parameters of the rho-Meson from Lattice QCD

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.

preprint2011arXivOpen access
Xu FengKarl JansenDru B. Renner
hep-exhep-phhep-lat
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Xu FengKarl JansenDru B. Renner

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