<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mn>33</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mn /><mml:mo>(</mml:mo><mml:mn>1232</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>resonance contribution to the amplitudes<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>M</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:

Aznauryan, I.G.; Stepanyan, S.

doi:10.1103/physrevd.59.054009

Cited by 14 publications

(9 citation statements)

References 49 publications

(56 reference statements)

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“…Such calculations can be split into the so-called bare and dressed parts, which represent the nucleon/delta core, and the pion cloud, respectively. This is also attempted within dispersion relation approaches [50]. While, in general, such a separation suffers from an unitary ambiguity [51], the models yield consistent results.…”

Section: Discussionmentioning

confidence: 88%

Photo- and electro-excitation of the Δ-resonance at MAMI

Schmieden

2006

Eur. Phys. J. A

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Abstract. Over the last decade accurate experiments at MAMI played an essential role to improve our understanding of the nucleon to ∆(1232) transition. Originally to a large extent motivated through intraquark hyperfine interactions anticipated in QCD-inspired quark models they showed that pionic degrees of freedom are essential. The meson cloud is mainly responsible for the observed quadrupole excitation strength and affects the magnetic dipole transition strength as well.

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Section: Discussionmentioning

confidence: 88%

Photo- and electro-excitation of the Δ-resonance at MAMI

Schmieden

2006

Eur. Phys. J. A

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“…In this analysis the low-energy benchmark data are analyzed using fixedt dispersion relations within the approach which is close to the approach developed in Refs. 13,14,15,16 . The real parts of the amplitudes are constructed through real parts of invariant amplitudes A…”

Section: Resultsmentioning

confidence: 99%

Multipole Analysis of a Benchmark Data Set for Pion Photoproduction

Arndt¹,

Aznauryan²,

Davidson³

et al. 2001

Nstar 2001

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We have fitted low-and medium-energy benchmark datasets employing methods used in the MAID/SAID and dynamical model analyses. Independent fits from the Mainz, RPI, Yerevan, and Kharkov groups have also been performed over the low-energy region. Results for the multipole amplitudes are compared in order to gauge the model-dependence of such fits, given identical data and a single method for error handling.

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“…[62][63][64][65][66][67] for the ratio G C /G M and of Refs. [62,[65][66][67] + . PDG gives an upper limit of 6 MeV 1/2 for the total Nρ width.…”

Section: B Relative Sign Of the Photo-and Electroproduction Amplitudmentioning

confidence: 99%

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

et al. 2002

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Relativistic, kinematically complete phenomenological expressions for the dilepton decay rates of nucleon resonances with arbitrary spin and parity are derived in terms of the magnetic, electric, and Coulomb transition form factors. The dilepton decay rates of the nucleon resonances with masses below 2 GeV are estimated using the extended vector meson dominance (VMD) model for the transition form factors. The model provides a unified description of the photo-and electroproduction data, γ (γ * )N → N * , the vector meson decays, N * → N ϕ (ω), and the dilepton decays, N * → N + − . The constraints on the transition form factors from the quark counting rules are taken into account. The parameters of the model are fixed by fitting the available photo-and electroproduction data and using results of the multichannel partial-wave analysis of the π N scattering. Where experimental data are not available, predictions of the non-relativistic quark models are used as an input. The vector meson coupling constants of the magnetic, electric, and Coulomb types are determined. The dilepton widths and the dilepton spectra from decays of nucleon resonances with masses below 2 GeV are calculated. C 2002 Elsevier Science (USA)

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P33(1232)resonance contribution to the amplitudesM1+

Cited by 14 publications

References 49 publications

Photo- and electro-excitation of the Δ-resonance at MAMI

Photo- and electro-excitation of the Δ-resonance at MAMI

Multipole Analysis of a Benchmark Data Set for Pion Photoproduction

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

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