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Pion-nucleon scattering in the Roper channel from lattice QCD

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Lang, C. B. ; Leskovec, L. ; Padmanath, M. ; Prelovsek, S.
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Date of publication of this fulltext: 20 Mar 2019 12:51


We present a lattice QCD study of N pi scattering in the positive-parity nucleon channel, where the puzzling Roper resonance N*(1440) resides in experiment. The study is based on the PACS-CS ensemble of gauge configurations with N-f = 2 + 1 Wilson-clover dynamical fermions, m pi similar or equal to 156 MeV and L similar or equal to 2.9 fm. In addition to a number of qqq interpolating fields, we ...


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