Details

Autor(en) / Beteiligte

• Padmanath, M.
• Lang, C. B.
• Leskovec, Luka
• Prelovsek, Sasa
• Pena Ruano, C.
• Gámiz Sánchez, E.
• Della Morte, M.
• Fritzsch, P.

Titel

Nπ scattering in the Roper channel

Ist Teil von

• EPJ Web of Conferences, 2018-01, Vol.175, p.5004

Ort / Verlag

Les Ulis: EDP Sciences

Erscheinungsjahr

2018

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• We present results from our recent lattice QCD study of Nπ scattering in the positive-parity nucleon channel, where the puzzling Roper resonance N *(1440) resides in experiment. Using a variety of hadron operators, that include qqq -like, Nπ in p -wave and Nσ in s-wave, we systematically extract the excited lattice spectrum in the nucleon channel up to 1.65 GeV. Our lattice results indicate that Nπ scattering in the elastic approximation alone does not describe a low-lying Roper. Coupled channel effects between Nπ and Nππ seem to be crucial to render a low-lying Roper in experiment, reinforcing the notion that this state could be a dynamically generated resonance. After giving a brief motivation for studying the Roper channel and the relevant technical details to this study, we will discuss the results and the conclusions based on our lattice investigation and in comparison with other lattice calculations.