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    A lattice QCD study of pion-nucleon scattering in the Roper channel

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    Final Accepted Manuscript
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    Author
    Leskovec, Luka
    Lang, Christian, B
    Padmanath, M.
    Prelovsek, Sasa
    Affiliation
    University of Graz
    Regensburg University
    University of Ljubljana
    Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
    Issue Date
    2018-09
    Keywords
    Hadrons
    lattice QCD
    
    Metadata
    Show full item record
    Publisher
    SPRINGER WIEN
    Citation
    Leskovec, L., Lang, C.B., Padmanath, M. et al. Few-Body Syst (2018) 59: 95. https://doi.org/10.1007/s00601-018-1419-2
    Journal
    FEW-BODY SYSTEMS
    Rights
    © Springer-Verlag GmbH Austria, part of Springer Nature 2018
    Abstract
    We present a lattice QCD study of the puzzling positive-parity nucleon channel, where the Roper resonance N∗(1440) resides in experiment. The study is based on an ensemble of gauge configurations with Nf=2+1 Wilson-clover fermions with a pion mass of 156 MeV and lattice size L=2.9 fm. We use several qqq interpolating fields combined with Nπ and Nσ two-hadron operators in calculating the energy spectrum in the rest frame. Combining experimental Nπ phase shifts with elastic approximation and the Lüscher formalism suggests in the spectrum an additional energy level near the Roper mass mR=1.43 GeV for our lattice. We do not observe any such additional energy level, which implies that Nπ elastic scattering alone does not render a low-lying Roper resonance. The current status indicates that the N∗(1440) might arise as dynamically generated resonance from coupling to other channels, most notably the Nππ .
    Description
    cf. https://arxiv.org/abs/1806.02363
    Note
    12 month embargo; published online: 8 June 2018
    ISSN
    0177-7963
    DOI
    10.1007/s00601-018-1419-2
    Version
    Final accepted manuscript
    Sponsors
    Slovenian Research Agency ARRS; Austrian Science Fund [FWF:I1313-N27]; Deutsche Forschungsgemeinschaft [SFB/TRR 55]; EU [MSCA-IF-EF-ST-744659]
    Additional Links
    http://inspirehep.net/record/1676801
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00601-018-1419-2
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