Pole positions and residues from pion photoproduction using the Laurent-Pietarinen expansion method

Švarc, Alfred; Hadžimehmedović, M.; Osmanović, H.; Stahov, J.; Tiator, L.; Workman, R. L.

doi:10.1103/physrevc.89.065208

Cited by 35 publications

(40 citation statements)

References 34 publications

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“…[89], however, the results from a Laurent-Pietarinen (L+P) expansion of the GW-SAID CM12 solution [58] for pion photoproduction give a pole position of E 0 = 1655(11) − i63.5 (8.5) MeV, which is closer to our values. As in fit A had , the current fits reveal a strong coupling to the KY channels.…”

Section: A Discussion Of Specific Resonancessupporting

confidence: 64%

“…While fit 2 yielded a value smaller than the one of Ref. [89], the photocoupling is now larger in fit A and B.…”

Section: A Discussion Of Specific Resonancesmentioning

confidence: 76%

“…In the GWU-SAID solutions analyzed in Refs. [88,89] and the Bonn-Gatchina analysis [90], widths of about 110 MeV are also found. With -2Im E 0 =78 MeV, a smaller width was extracted in the ANL-Osaka analysis [46].…”

Section: A Discussion Of Specific Resonancesmentioning

confidence: 77%

“…In different GW-SAID solutions [88,89] and in the Bonn-Gatchina analysis of Ref. [90] the N (1720) 3/2 + has a pole position with a real part 20 to 80 MeV lower than in our fits and an imaginary part more than 50 MeV larger.…”

Section: A Discussion Of Specific Resonancesmentioning

confidence: 85%

“…In the L+P analysis of the GW-SAID CM12 solution in Ref. [89], a broad state with a higher mass associated with this resonance is found that can be alternatively explained as the ρN complex branch point. However, the authors state that additional information from other decay channels beside πN is needed to distinguish between the two options.…”

Section: A Discussion Of Specific Resonancesmentioning

confidence: 99%

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Eta photoproduction in a combined analysis of pion- and photon-induced reactions

et al. 2015

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The ηN final state is isospin-selective and thus provides access to the spectrum of excited nucleons without being affected by excited ∆ states. To this end, the world database on eta photoproduction off the proton up to a center-of-mass energy of E ∼ 2.3 GeV is analyzed, including data on differential cross sections, and single and double polarization observables. The resonance spectrum and its properties are determined in a combined analysis of eta and pion photoproduction off the proton together with the reactions πN → πN , ηN , KΛ and KΣ. For the analysis, the so-called Jülich coupled-channel framework is used, incorporating unitarity, analyticity, and effective three-body channels. Parameters tied to photoproduction and hadronic interactions are varied simultaneously. The influence of recent MAMI T and F asymmetry data on the eta photoproduction amplitude is discussed in detail.

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Section: A Discussion Of Specific Resonancessupporting

confidence: 64%

“…While fit 2 yielded a value smaller than the one of Ref. [89], the photocoupling is now larger in fit A and B.…”

Section: A Discussion Of Specific Resonancesmentioning

confidence: 76%

Section: A Discussion Of Specific Resonancesmentioning

confidence: 77%

Section: A Discussion Of Specific Resonancesmentioning

confidence: 85%

Section: A Discussion Of Specific Resonancesmentioning

confidence: 99%

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Eta photoproduction in a combined analysis of pion- and photon-induced reactions

et al. 2015

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The MAID Legacy and Future

Tiator

2018

Few-Body Syst

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The MAID project is a collection of theoretical models for pseudoscalar meson photo-and electroproduction from nucleons. It is online available and produces results in real time calculations. In addition to kinematical variables also model parameters, especially for baryon resonances, can be online changed and investigated. Over 20 years MAID has become quite popular and the MAID web pages have been called more than 7.7 million times. Keywords pion electroproduction · baryon resonances · transition form factors 1 IntroductionAfter the exploration of the baryonic spectrum with pion scattering in the 1980s, photo-and electroproduction of mesons, mainly at Mainz, Bonn and JLab have become the main source of further investigations of N and ∆ resonances. Among them, pion electroproduction is the main source for investigations of the transition form factors of the nucleon to excited N and ∆ baryons. In addition also two-pion and eta electroproduction have been very useful for studies of selected nucleon resonances. After early measurements of the G * M form factor of the N → ∆(1232) transition already in the 1960s, in the 1990s a large program was running at Mainz, Bonn, Bates and JLab in order to measure the very small E/M ratio of the N → ∆ transition and the Q 2 dependence of the E/M and S/M ratios in order to get information on the internal quadrupole deformation of the nucleon and the ∆. In parallel large progress was achieved in various kinds of quark models that gave predictions to N → N * and N → ∆ * transition form factors. Only at JLab both the energy and the photon virtuality were available to measure those form factors for a set of nucleon resonances up to Q 2 ≈ 5 GeV 2 . Two recent review articles on the electromagnetic excitation of nucleon resonances give a very good overview over experiment and theory and latest developments [1; 2].

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