The reaction πN → ππN in a meson-exchange approach

Schneider, S.; Krewald, S.; Meißner, Ulf‐G.

doi:10.1140/epja/i2006-10030-0

Cited by 23 publications

(21 citation statements)

References 32 publications

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“…Close to threshold the findings of [43] demonstrate a nice agreement with experiment. These results also support a large contribution from the Roper resonance to the π − p → π + π − n and π − p → π 0 π 0 n reactions which is in line with the conclusions of [33,37].…”

Section: Overview Of the πN → 2πn Reactionsupporting

confidence: 77%

2πproduction in the Giessen coupled-channels model

2016

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The coupled channels Lagrangian approach underlying the Giessen model (GiM) is extended to describe the πN → πN , 2πN scattering in the resonance energy region. As a feasibility study we investigate single and double pion production up to the second resonance region. The 2πN production has been significantly improved by using the isobar approximation with σN and π∆(1232) in the intermediate state. The three-body unitarity is maintained up to interference pattern between the isobar subchannels. The scattering amplitudes are obtained as a solution of the Bethe-Salpeter equation in the K matrix approximation. As a first application we perform a partial wave analysis of the πN → πN , π 0 π 0 N reactions in the Roper resonance region. We obtain R σN (1440) = 27 +4 −9 % and R π∆ (1440) = 12 +5 −3 % for the σN and π∆(1232) decay branching ratios of N * (1440) respectively. The extracted πN inelasticities and reaction amplitudes are consistent with the results from other groups.

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Section: Overview Of the πN → 2πn Reactionsupporting

confidence: 77%

2πproduction in the Giessen coupled-channels model

2016

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“…(For details, see e.g., Refs. [10,[24][25][26][27][28][29][30][31][32] and a review [33].) The nonvalence quark degrees of freedom was also introduced by coupling the pion and other meson fields to the valence quarks [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Valence quark contributions for theγN→P11(1440)form factors

Ramalho¹,

Tsushima

2010

Phys. Rev. D

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“…The Roper resonance can then be interpreted within a coupled-channel meson exchange model based on an effective chiral-symmetric Lagrangian [9]; no genuine N(1440) (3 quark) resonance was needed to fit πN phase shifts and inelasticities, in agreement with [10]. Motivated by the Q 2 dependence of the Roper helicity amplitude which would seem to suggest a hybrid nature [11], Capstick and Page [12] calculated masses of baryonic hybrids.…”

Section: Introductionmentioning

confidence: 99%