The ρ-resonance from Nf = 2 lattice QCD including the physical pion mass
Collaborations
•7 pages
Published in:
- Phys.Lett.B 819 (2021) 136449
- Published: Jun 16, 2021and
- Published: Aug 10, 2021
e-Print:
- 2006.13805 [hep-lat]
DOI:
- 10.1016/j.physletb.2021.136449 (publication)
Experiments:
View in:
Citations per year
Abstract: (Elsevier B.V.)
We present a lattice computation of ππ–scattering in the channel with dynamical quark flavours obtained with ensembles bracketing the physical value of the pion mass. Employing a global fit to data at three values of the pion mass, we determine the universal parameters of the ρ-resonance. We carefully investigate systematic uncertainties by determining energy eigenvalues using different methods and by comparing inverse amplitude method and Breit-Wigner type parametrizations. Overall, exploring the complex energy plane we find mass and width , including statistical and systematic uncertainties. In contrast to previous extrapolations from higher than physical pion mass results, our mass value is in good agreement with experiment, while the width is too high.Note:
- raw data available in data repository: https://github.com/urbach/datarhonf2
- pi: mass
- quark: flavor
- lattice field theory
- parametrization
- Breit-Wigner
- statistical
- lattice
References(69)
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