Disentangling the Dynamical Origin ofP11Nucleon Resonances

Abstract

We show that two almost degenerate poles near the piDelta threshold and the next higher mass pole in the P11 partial wave of piN scattering evolve from a single bare state through its coupling with piN, etaN, and pipiN reaction channels. This finding provides new information on understanding the dynamical origins of the Roper N{*}(1440) and N{*}(1710) resonances listed by Particle Data Group. Our results for the resonance poles in other piN partial waves are also presented.

Baryons as relativistic three-quark bound states

“…Indeed, such effects are predicted e.g. in the analysis of the EBAC group [73], whereas in the Jülich framework no such bare state is needed [422]. The result is interesting because it shows that a mutually consistent description of quark-core states for the nucleon and its first radial excitation is in principle possible in such models.…”

“…Ref. [12], and the movement and conjunction of poles if rescattering effects are switched off [73]. An open issue in coupled-channel approaches is how many 'bare' states one has to include.…”

“…2.6 is solved in dynamical coupled-channel models which also take into account the dispersive parts from intermediate channels. Among those are the Sato-Lee model [70], which has been extended by the EBAC [71][72][73] and ANL/Osaka collaborations [74] and extensively applied to analyze pion photo-and electroproduction data. The Dubna-Mainz-Taiwan (DMT) [75,76], Valencia [77], Jülich-Bonn [78,79] and GSI models [80][81][82] have been developed along similar lines.…”

Light-Quark Baryon Spectroscopy from ANL-Osaka Dynamical Coupled-Channels Analysis

“…Among those studies, the ones with dynamical-model approaches have further revealed the crucial role of (multichannel) reaction dynamics in understanding the mass spectrum, structure, and dynamical origin of baryon resonances (see, e.g., Refs. [11,12]). Similar studies based on a dynamical-model approach have also performed recently by us for the Λ * and Σ * sector [13,14].…”

Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum

“…One is the dynamical origin of P 11 N * resonances [11]. Figure 3 shows pole positions of P 11 N * resonances extracted from a dynamical model developed in Ref.…”