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dc.contributor.authorLeskovec, Luka
dc.contributor.authorLang, Christian, B
dc.contributor.authorPadmanath, M.
dc.contributor.authorPrelovsek, Sasa
dc.date.accessioned2018-08-02T17:28:14Z
dc.date.available2018-08-02T17:28:14Z
dc.date.issued2018-09
dc.identifier.citationLeskovec, L., Lang, C.B., Padmanath, M. et al. Few-Body Syst (2018) 59: 95. https://doi.org/10.1007/s00601-018-1419-2en_US
dc.identifier.issn0177-7963
dc.identifier.doi10.1007/s00601-018-1419-2
dc.identifier.urihttp://hdl.handle.net/10150/628326
dc.descriptioncf. https://arxiv.org/abs/1806.02363en_US
dc.description.abstractWe 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 .en_US
dc.description.sponsorshipSlovenian Research Agency ARRS; Austrian Science Fund [FWF:I1313-N27]; Deutsche Forschungsgemeinschaft [SFB/TRR 55]; EU [MSCA-IF-EF-ST-744659]en_US
dc.language.isoenen_US
dc.publisherSPRINGER WIENen_US
dc.relation.urlhttp://inspirehep.net/record/1676801en_US
dc.rights© Springer-Verlag GmbH Austria, part of Springer Nature 2018en_US
dc.subjectHadronsen_US
dc.subjectlattice QCDen_US
dc.titleA lattice QCD study of pion-nucleon scattering in the Roper channelen_US
dc.typeProceedingsen_US
dc.contributor.departmentUniversity of Grazen_US
dc.contributor.departmentRegensburg Universityen_US
dc.contributor.departmentUniversity of Ljubljanaen_US
dc.contributor.departmentUniv Arizona, Dept Phys, Tucson, AZ 85721 USAen_US
dc.identifier.journalFEW-BODY SYSTEMSen_US
dc.description.note12 month embargo; published online: 8 June 2018en_US
dc.eprint.versionFinal accepted manuscripten_US


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