Complex mass renormalization in EFT

Djukanovic, Dalibor; Gegelia, J.; Keller, Adrian; Scherer, Stefan

doi:10.48550/arxiv.1001.1772

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Therefore, in this work we will follow the strategy of Refs. [39,40] where m ρ and Γ ρ are considered as the real and imaginary part of the complex pole of the ρ-meson propagator. Hence, we introduce the complex pole parameter Z defined through…”

Section: E Quark Mass Dependencementioning

confidence: 99%

Resonance Parameters of the rho-Meson from Lattice QCD

Feng,

Jansen,

Renner

2010

Preprint

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We perform a nonperturbative lattice calculation of the P-wave pion-pion scattering phase in the ρ-meson decay channel using two flavors of maximally twisted mass fermions at pion masses ranging from 480 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 ρ-meson mass and decay width and to study their quark mass dependence.

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Section: E Quark Mass Dependencementioning

confidence: 99%

Resonance Parameters of the rho-Meson from Lattice QCD

Feng,

Jansen,

Renner

2010

Preprint

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“…( 36) is in the right ballpark, when compared to the numbers given in Refs. [62,63], where 16 GeV −1 is quoted. From Refs.…”

Section: Discussionmentioning

confidence: 99%

Hadron–Hadron interactions from $$N_\mathrm{{f}}=2+1+1$$ lattice QCD: the $$\rho \,$$-resonance

et al. 2020

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We present an investigation of the ρ-meson from N f = 2 + 1 + 1 flavour lattice QCD.The calculation is performed based on gauge configuration ensembles produced by the ETM collaboration with three lattice spacing values and pion masses ranging from 230 MeV to 500 MeV. Applying the Lüscher method phase shift curves are determined for all ensembles separately. Assuming a Breit-Wigner form, the ρ-meson mass and width are determined by a fit to these phase shift curves. Mass and width combined are then extrapolated to the chiral limit, while lattice artefacts are not detectable within our statistical uncertainties. For the ρmeson mass extrapolated to the physical point we find good agreement with experiment. The corresponding decay width differs by about two standard deviations from the experimental value.

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Complex mass renormalization in EFT

Abstract: We consider an effective field theory of unstable particles (resonances) using the complex-mass renormalization. As an application we calculate the masses and the widths of the ρ meson and the Roper resonance.

Cited by 2 publications

References 15 publications

Resonance Parameters of the rho-Meson from Lattice QCD

Resonance Parameters of the rho-Meson from Lattice QCD

Hadron–Hadron interactions from $$N_\mathrm{{f}}=2+1+1$$ lattice QCD: the $$\rho \,$$-resonance

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